| guestimate | (noun) an estimate that combines reasoning with guessing | Synonyms: guesstimate |
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| gyrate | (verb) to wind or move in a spiral course | Synonyms: coil, spiral |
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| (verb) revolve quickly and repeatedly around one's own axis | Synonyms: reel, spin, spin around, whirl |
| habilitate | (verb) provide with clothes or put clothes on | Synonyms: apparel, clothe, dress, enclothe, fit out, garb, garment, raiment, tog |
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| (verb) qualify for teaching at a university in Europe | - |
| habituate | (verb) make psychologically or physically used (to something) | Synonyms: accustom |
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| (verb) take or consume (regularly or habitually) | Synonyms: use |
| haemagglutinate | (verb) cause the clumping together (of red blood cells) | Synonyms: hemagglutinate |
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| hallucinate | (verb) perceive what is not there; have illusions | - |
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| hamate | (noun) the wrist bone in line with the 4th and 5th fingers | Synonyms: hamate bone, os hamatum, unciform bone |
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| hastate | (adjective) (of a leaf shape) like a spear point, with flaring pointed lobes at the base | Synonyms: spearhead-shaped |
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| hate | (noun) the emotion of intense dislike; a feeling of dislike so strong that it demands action | Synonyms: hatred |
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| (verb) to have and express negative sentiments about a person | - |
| (verb) dislike intensely; feel antipathy or aversion towards | Synonyms: detest |
| hellgrammiate | (noun) large brown aquatic larva of the dobsonfly; used as fishing bait | Synonyms: dobson |
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| helpmate | (noun) a helpful partner | Synonyms: helpmeet |
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| hemagglutinate | (verb) cause the clumping together (of red blood cells) | Synonyms: haemagglutinate |
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| hesitate | (verb) pause or hold back in uncertainty or unwillingness | Synonyms: waffle, waver |
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| (verb) interrupt temporarily an activity before continuing | Synonyms: pause |
| hibernate | (verb) sleep during winter | Synonyms: hole up |
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| (verb) be in an inactive or dormant state | - |
| homogenate | (noun) material that has been homogenized (especially tissue that has been ground and mixed) | - |
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| horripilate | (verb) cause (someone's) hair to stand on end and to have goosebumps | - |
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| (verb) have one's hair stand on end and get goosebumps | - |
| hotplate | (noun) a portable electric appliance for heating or cooking or keeping food warm | Synonyms: hot plate |
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| housemate | (noun) someone who resides in the same house with you | - |
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| humate | (noun) material that is high in humic acids | - |
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| humiliate | (verb) cause to feel shame; hurt the pride of | Synonyms: abase, chagrin, humble, mortify |
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| hydrate | (noun) any compound that contains water of crystallization | - |
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| (verb) cause to be hydrated; add water or moisture to | - |
| (verb) become hydrated and combine with water | - |
| (verb) supply water or liquid to in order to maintain a healthy balance | - |
| hydrogenate | (verb) combine or treat with or expose to hydrogen; add hydrogen to the molecule of (an unsaturated organic compound) | - |
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| hydrolysate | (noun) a product of hydrolysis | - |
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| hyperventilate | (verb) breathe excessively hard and fast | - |
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| (verb) produce hyperventilation in | - |
| hyphenate | (verb) divide or connect with a hyphen | Synonyms: hyphen |
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| hypothecate | (verb) to believe especially on uncertain or tentative grounds | Synonyms: conjecture, hypothesise, hypothesize, speculate, suppose, theorise, theorize |
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| (verb) pledge without delivery or title of possession | - |
| ideate | (verb) form a mental image of something that is not present or that is not the case | Synonyms: conceive of, envisage, imagine |
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| illegitimate | (adjective) of marriages and offspring; not recognized as lawful | - |
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| (adjective) contrary to or forbidden by law | Synonyms: illicit, outlaw, outlawed, unlawful |
| (noun) the illegitimate offspring of unmarried parents | Synonyms: bastard, by-blow, illegitimate child, love child, whoreson |
| illiterate | (adjective) not able to read or write | - |
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| (adjective) lacking culture, especially in language and literature | - |
| (adjective) uneducated in the fundamentals of a given art or branch of learning; lacking knowledge of a specific field | Synonyms: ignorant |
| (noun) a person unable to read | Synonyms: illiterate person, nonreader |
| illuminate | (verb) introduce light into | Synonyms: illume, illumine, light, light up |
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| (verb) make free from confusion or ambiguity; make clear | Synonyms: clear, clear up, crystalise, crystalize, crystallise, crystallize, elucidate, enlighten, shed light on, sort out, straighten out |
| (verb) add embellishments and paintings to (medieval manuscripts) | - |
| illustrate | (verb) clarify by giving an example of | Synonyms: exemplify, instance |
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| (verb) depict with an illustration | - |
| (verb) supply with illustrations | - |
| imbricate | (adjective) used especially of leaves or bracts; overlapping or layered as scales or shingles | Synonyms: imbricated |
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| (verb) overlap | - |
| (verb) place so as to overlap | - |
| imitate | (verb) reproduce someone's behavior or looks | Synonyms: copy, simulate |
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| (verb) make a reproduction or copy of | - |
| (verb) appear like, as in behavior or appearance | - |
| immaculate | (adjective) completely neat and clean | Synonyms: speckless, spic-and-span, spic, spick-and-span, spick, spotless |
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| (adjective) without fault or error | Synonyms: faultless, impeccable, incorrupted |
| (adjective) free from stain or blemish | Synonyms: undefiled |
| immediate | (adjective) having no intervening medium | - |
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| (adjective) very close or connected in space or time | Synonyms: contiguous |
| (adjective) performed with little or no delay | Synonyms: prompt, quick, straightaway |
| (adjective) of the present time and place | - |
| (adjective) immediately before or after as in a chain of cause and effect | - |
| immigrate | (verb) come into a new country and change residency | - |
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| (verb) migrate to a new environment | - |
| (verb) introduce or send as immigrants | - |
| immoderate | (adjective) beyond reasonable limits | - |
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| immolate | (verb) offer as a sacrifice by killing or by giving up to destruction | - |
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| imparipinnate | (adjective) (a leaf shape) pinnate with a single leaflet at the apex | Synonyms: odd-pinnate |
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| imperforate | (adjective) not perforated; having no opening | - |
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| impersonate | (verb) pretend to be someone you are not; sometimes with fraudulent intentions | Synonyms: personate, pose |
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| (verb) represent another person with comic intentions | - |
| (verb) assume or act the character of | Synonyms: portray |
| implicate | (verb) impose, involve, or imply as a necessary accompaniment or result | Synonyms: entail |
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| (verb) bring into intimate and incriminating connection | - |
| importunate | (adjective) persistent to the point of annoying | - |
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| (adjective) expressing persistant and earnest entreaty | - |
| imprecate | (verb) utter obscenities or profanities | Synonyms: blaspheme, curse, cuss, swear |
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| (verb) wish harm upon; invoke evil upon | Synonyms: anathemise, anathemize, bedamn, beshrew, curse, damn, maledict |
| impregnate | (verb) make pregnant | Synonyms: bang up, knock up, prang up |
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| (verb) fertilize and cause to grow | - |
| (verb) infuse or fill completely | Synonyms: saturate |
| (verb) fill, as with a certain quality | Synonyms: infuse, instill, tincture |
| inaccurate | (adjective) erroneous | - |
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| inactivate | (verb) make inactive | Synonyms: deactivate |
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| (verb) release from military service or remove from the active list of military service | Synonyms: demobilise, demobilize |
| inadequate | (adjective) lacking the requisite qualities or resources to meet a task | Synonyms: unequal |
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| (adjective) of insufficient quantity to meet a need | Synonyms: jejune, poor, short |
| inanimate | (adjective) not endowed with life | Synonyms: non-living, nonliving |
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| (adjective) belonging to the class of nouns denoting nonliving things | - |
| (adjective) appearing dead; not breathing or having no perceptible pulse | Synonyms: breathless, pulseless |
| inappropriate | (adjective) not suitable for a particular occasion etc | - |
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| (adjective) not in keeping with what is correct or proper | Synonyms: incompatible, out of keeping, unfitting |
| inarticulate | (adjective) without or deprived of the use of speech or words | Synonyms: unarticulate |
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| inaugurate | (verb) be a precursor of | Synonyms: introduce, usher in |
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| (verb) commence officially | Synonyms: kick off |
| (verb) open ceremoniously or dedicate formally | - |
| incapacitate | (verb) injure permanently | Synonyms: disable, handicap, invalid |
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| (verb) make unable to perform a certain action | Synonyms: disable, disenable |
| incarcerate | (verb) lock up or confine, in or as in a jail | Synonyms: gaol, immure, imprison, jail, jug, lag, put away, put behind bars, remand |
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| incarnate | (adjective) invested with a bodily form especially of a human body | - |
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| (adjective) possessing or existing in bodily form | Synonyms: bodied, corporal, corporate, embodied |
| (verb) make concrete and real | - |
| (verb) represent in bodily form | Synonyms: body forth, embody, substantiate |
| inchoate | (adjective) only partly in existence; imperfectly formed | Synonyms: incipient |
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| incinerate | (verb) cause to undergo combustion | Synonyms: burn |
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| (verb) become reduced to ashes | - |
| incommensurate | (adjective) not corresponding in size or degree or extent | - |
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| inconsiderate | (adjective) lacking regard for the rights or feelings of others | - |
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| (adjective) without proper consideration or reflection | Synonyms: unconsidered |
| incorporate | (adjective) formed or united into a whole | Synonyms: incorporated, integrated, merged, unified |
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| (verb) make into a whole or make part of a whole | Synonyms: integrate |
| (verb) unite or merge with something already in existence | - |
| (verb) form a corporation | - |
| (verb) include or contain; have as a component | Synonyms: comprise, contain |
| incriminate | (verb) bring an accusation against; level a charge against | Synonyms: accuse, criminate, impeach |
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| (verb) suggest that someone is guilty | Synonyms: imply, inculpate |
| incubate | (verb) sit on (eggs) | Synonyms: brood, cover, hatch |
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| (verb) grow under conditions that promote development | - |
| inculcate | (verb) teach and impress by frequent repetitions or admonitions | Synonyms: infuse, instill |
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| inculpate | (verb) suggest that someone is guilty | Synonyms: imply, incriminate |
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| incurvate | (adjective) bent into or having an inward curve | Synonyms: incurved |
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| (verb) cause to curve inward | - |
| (verb) bend inwards | - |
| indelicate | (adjective) lacking propriety and good taste in manners and conduct | Synonyms: indecorous |
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| (adjective) verging on the indecent | - |
| (adjective) in violation of good taste even verging on the indecent | Synonyms: off-color, off-colour |
| indeterminate | (adjective) not precisely determined or established; not fixed or known in advance | Synonyms: undetermined |
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| (adjective) having a capacity for continuing to grow at the apex | - |
| (adjective) of uncertain or ambiguous nature | - |
| (adjective) not leading to a definite ending or result | - |
| (adjective) (of a quantity) having no definite value, as an equation that cannot be solved | - |
| indicate | (verb) to state or express briefly | - |
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| (verb) be a signal for or a symptom of | Synonyms: bespeak, betoken, point, signal |
| (verb) give evidence of | Synonyms: argue |
| (verb) indicate a place, direction, person, or thing; either spatially or figuratively | Synonyms: designate, point, show |
| (verb) suggest the necessity of an intervention; in medicine | - |
| indiscriminate | (adjective) not marked by fine distinctions | - |
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| (adjective) failing to make or recognize distinctions | - |
| individuate | (verb) give individual shape or form to | - |
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| (verb) give individual character to | - |
| indoctrinate | (verb) teach doctrines to; teach uncritically | - |
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| indurate | (adjective) emotionally hardened | Synonyms: callous, pachydermatous |
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| (verb) become hard or harder | Synonyms: harden |
| (verb) make hard or harder | Synonyms: harden |
| (verb) become fixed or established | - |
| (verb) cause to accept or become hardened to; habituate | Synonyms: harden, inure |
| inebriate | (noun) a chronic drinker | Synonyms: drunk, drunkard, rummy, sot, wino |
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| (verb) become drunk or drink excessively | Synonyms: hit it up, soak, souse |
| (verb) make drunk (with alcoholic drinks) | Synonyms: intoxicate, soak |
| (verb) fill with sublime emotion | Synonyms: beatify, exalt, exhilarate, thrill, tickle pink |
| inelaborate | (adjective) not elaborate; lacking rich or complex detail | Synonyms: unelaborate |
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| infatuate | (verb) arouse unreasoning love or passion in and cause to behave in an irrational way | - |
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| infiltrate | (verb) pass through an enemy line; in a military conflict | Synonyms: pass through |
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| (verb) cause (a liquid) to enter by penetrating the interstices | - |
| (verb) pass into or through by filtering or permeating | - |
| (verb) enter a group or organization in order to spy on the members | Synonyms: penetrate |
| inflate | (verb) fill with gas or air | Synonyms: blow up |
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| (verb) exaggerate or make bigger | Synonyms: amplify, blow up, expand |
| (verb) become inflated | Synonyms: balloon, billow |
| (verb) increase the amount or availability of, creating a rise in value | - |
| (verb) cause prices to rise by increasing the available currency or credit | - |
| infuriate | (verb) make furious | Synonyms: exasperate, incense |
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| infuscate | (verb) darken with a brownish tinge, as of insect wings | - |
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| ingeminate | (verb) to say, state, or perform again | Synonyms: iterate, reiterate, repeat, restate, retell |
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| ingrate | (noun) a person who shows no gratitude | Synonyms: thankless wretch, ungrateful person |
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| ingratiate | (verb) gain favor with somebody by deliberate efforts | - |
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| ingurgitate | (verb) overeat or eat immodestly; make a pig of oneself | Synonyms: binge, englut, engorge, glut, gorge, gormandise, gormandize, gourmandize, overeat, overgorge, overindulge, pig out, satiate, scarf out, stuff |
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| initiate | (noun) people who have been introduced to the mysteries of some field or activity | Synonyms: enlightened |
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| (noun) someone who has been admitted to membership in a scholarly field | Synonyms: learned person, pundit, savant |
| (noun) someone new to a field or activity | Synonyms: beginner, novice, tiro, tyro |
| (verb) set in motion, start an event or prepare the way for | Synonyms: lead up |
| (verb) bring up a topic for discussion | Synonyms: broach |
| (verb) take the lead or initiative in; participate in the development of | Synonyms: pioneer |
| (verb) bring into being | Synonyms: originate, start |
| (verb) accept people into an exclusive society or group, usually with some rite | Synonyms: induct |
| inmate | (noun) one of several resident of a dwelling (especially someone confined to a prison or hospital) | - |
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| (noun) a patient who is residing in the hospital where he is being treated | Synonyms: inpatient |
| (noun) a person serving a sentence in a jail or prison | Synonyms: con, convict, yard bird, yardbird |
| innate | (adjective) not established by conditioning or learning | Synonyms: unconditioned, unlearned |
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| (adjective) being talented through inherited qualities | Synonyms: born, natural |
| (adjective) present at birth but not necessarily hereditary; acquired during fetal development | Synonyms: congenital, inborn |
| innervate | (verb) stimulate to action | - |
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| (verb) supply nerves to (some organ or body part) | - |
| innovate | (verb) bring something new to an environment | Synonyms: introduce |
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| innumerate | (adjective) lacking knowledge and understanding of mathematical concepts and methods | - |
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| inoculate | (verb) perform vaccinations or produce immunity in by inoculation | Synonyms: immunise, immunize, vaccinate |
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| (verb) insert a bud for propagation | - |
| (verb) impregnate with the virus or germ of a disease in order to render immune | - |
| (verb) introduce a microorganism into | - |
| (verb) introduce an idea or attitude into the mind of | - |
| inordinate | (adjective) beyond normal limits | Synonyms: excessive, undue, unreasonable |
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| inosculate | (verb) cause to join or open into each other by anastomosis | Synonyms: anastomose |
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| (verb) come together or open into each other | Synonyms: anastomose |
| insatiate | (adjective) impossible to satisfy | Synonyms: insatiable, unsatiable |
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| inseminate | (verb) introduce semen into (a female) | Synonyms: fecundate, fertilise, fertilize |
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| (verb) place seeds in or on (the ground) | Synonyms: sow, sow in |
| insensate | (adjective) devoid of feeling and consciousness and animation | Synonyms: insentient |
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| (adjective) without compunction or human feeling | Synonyms: cold-blooded, cold, inhuman |
| insinuate | (verb) give to understand | Synonyms: adumbrate, intimate |
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| (verb) introduce or insert (oneself) in a subtle manner | - |
| insolate | (verb) expose to the rays of the sun or affect by exposure to the sun | Synonyms: solarise, solarize, sun |
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| inspectorate | (noun) a body of inspectors | - |
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| inspissate | (verb) become thick or thicker | Synonyms: thicken |
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| (verb) make thick or thicker | Synonyms: thicken |
| (verb) make viscous or dense | Synonyms: thicken |
| instantiate | (verb) find an instance of (a word or particular usage of a word) | - |
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| (verb) represent by an instance | - |