| hindermost | (adjective) located farthest to the rear | Synonyms: backmost, hindmost, rearmost |
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| homeothermic | (adjective) of birds and mammals; having constant and relatively high body temperature | Synonyms: homoiothermic, homothermic |
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| homocercal | (adjective) possessing a symmetrical tail that extends beyond the end of the vertebral column (as in most bony fishes) | - |
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| homoerotic | (adjective) of or concerning homosexual love | - |
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| homoiothermic | (adjective) of birds and mammals; having constant and relatively high body temperature | Synonyms: homeothermic, homothermic |
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| homothermic | (adjective) of birds and mammals; having constant and relatively high body temperature | Synonyms: homeothermic, homoiothermic |
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| hungover | (adjective) Suffering the aftereffects of the consumption of alcohol | - |
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| hymenopterous | (adjective) of or relating to insects of the order Hymenoptera | - |
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| hyperactive | (adjective) more active than normal | Synonyms: overactive |
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| hyperbolic | (adjective) of or relating to a hyperbola | - |
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| (adjective) enlarged beyond truth or reasonableness | Synonyms: inflated |
| hyperboloidal | (adjective) having the shape of a hyperboloid | - |
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| hypercatalectic | (adjective) (verse) having an extra syllable or syllables at the end of a metrically complete verse or in a metrical foot | - |
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| hypercritical | (adjective) inclined to judge too severely | Synonyms: overcritical |
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| hyperemic | (adjective) relating to or caused by hyperemia | - |
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| hyperfine | (adjective) extremely fine or thin, as in a spectral line split into two or more components | - |
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| hypermetropic | (adjective) abnormal ability to focus of distant objects | Synonyms: hyperopic |
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| hyperopic | (adjective) abnormal ability to focus of distant objects | Synonyms: hypermetropic |
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| hypersensitised | (adjective) having an allergy or peculiar or excessive susceptibility (especially to a specific factor) | Synonyms: allergic, hypersensitive, hypersensitized, sensitised, sensitized, supersensitised, supersensitive, supersensitized |
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| hypersensitive | (adjective) having an allergy or peculiar or excessive susceptibility (especially to a specific factor) | Synonyms: allergic, hypersensitised, hypersensitized, sensitised, sensitized, supersensitised, supersensitive, supersensitized |
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| hypersensitized | (adjective) having an allergy or peculiar or excessive susceptibility (especially to a specific factor) | Synonyms: allergic, hypersensitised, hypersensitive, sensitised, sensitized, supersensitised, supersensitive, supersensitized |
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| hypertensive | (adjective) having abnormally high blood pressure | - |
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| hyperthermal | (adjective) of or relating to or affected by hyperthermia | - |
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| hypertonic | (adjective) (of a solution) having a higher osmotic pressure than a comparison solution | - |
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| (adjective) (of living tissue) in a state of abnormally high tension | - |
| hypertrophied | (adjective) (of an organ or body part) excessively enlarged as a result of increased size in the constituent cells | Synonyms: enlarged |
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| hypodermal | (adjective) of or relating to the hypodermis | - |
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| hypodermic | (adjective) relating to or located below the epidermis | Synonyms: subcutaneous |
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| hypothermic | (adjective) of or relating to or affected by hypothermia | - |
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| hysteric | (adjective) characterized by or arising from psychoneurotic hysteria | Synonyms: hysterical |
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| hysterical | (adjective) marked by excessive or uncontrollable emotion | - |
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| (adjective) characterized by or arising from psychoneurotic hysteria | Synonyms: hysteric |
| icteric | (adjective) affected by jaundice which causes yellowing of skin etc | Synonyms: jaundiced, yellow |
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| icterogenic | (adjective) producing jaundice | - |
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| illiberal | (adjective) narrow-minded about cherished opinions | Synonyms: intolerant |
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| 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 |
| immaterial | (adjective) not consisting of matter | Synonyms: nonmaterial |
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| (adjective) of no importance or relevance especially to a law case | - |
| (adjective) without material form or substance | Synonyms: incorporeal |
| (adjective) not pertinent to the matter under consideration | Synonyms: extraneous, impertinent, orthogonal |
| (adjective) (often followed by `to') lacking importance; not mattering one way or the other | Synonyms: indifferent |
| immoderate | (adjective) beyond reasonable limits | - |
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| immunotherapeutic | (adjective) of or relating to immunotherapy | - |
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| imperative | (adjective) requiring attention or action | - |
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| (adjective) relating to verbs in the imperative mood | - |
| imperceptible | (adjective) impossible or difficult to perceive by the mind or senses | Synonyms: unperceivable |
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| imperfect | (adjective) not perfect; defective or inadequate | - |
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| (adjective) wanting in moral strength, courage, or will; having the attributes of man as opposed to e.g. divine beings | Synonyms: fallible, frail, weak |
| imperfectible | (adjective) capable of being made imperfect | - |
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| imperforate | (adjective) not perforated; having no opening | - |
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| imperial | (adjective) befitting or belonging to an emperor or empress | - |
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| (adjective) relating to or associated with an empire | - |
| (adjective) of or belonging to the British Imperial System of weights and measures | - |
| (adjective) belonging to or befitting a supreme ruler | Synonyms: majestic, purple, regal, royal |
| imperialist | (adjective) of or relating to imperialism | Synonyms: imperialistic |
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| imperialistic | (adjective) of or relating to imperialism | Synonyms: imperialist |
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| imperious | (adjective) having or showing arrogant superiority to and disdain of those one views as unworthy | Synonyms: disdainful, haughty, lordly, overbearing, prideful, sniffy, supercilious, swaggering |
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| imperishable | (adjective) not perishable | - |
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| (adjective) lasting a long time | Synonyms: abiding, enduring |
| impermanent | (adjective) not permanent; not lasting | Synonyms: temporary |
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| (adjective) existing or enduring for a limited time only | - |
| impermeable | (adjective) preventing especially liquids to pass or diffuse through | - |
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| impermissible | (adjective) not permitted | - |
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| (adjective) not allowable | - |
| impersonal | (adjective) not relating to or responsive to individual persons | - |
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| (adjective) having no personal preference | Synonyms: neutral |
| impertinent | (adjective) improperly forward or bold | Synonyms: fresh, impudent, overbold, sassy, saucy, smart, wise |
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| (adjective) not pertinent to the matter under consideration | Synonyms: extraneous, immaterial, orthogonal |
| (adjective) characterized by a lightly pert and exuberant quality | Synonyms: irreverent, pert, saucy |
| imperturbable | (adjective) not easily perturbed or excited or upset; marked by extreme calm and composure | Synonyms: unflappable |
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| imperviable | (adjective) not admitting of passage or capable of being affected | Synonyms: impervious |
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| impervious | (adjective) not admitting of passage or capable of being affected | Synonyms: imperviable |
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| imponderable | (adjective) difficult or impossible to evaluate with precision | - |
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| impoverished | (adjective) destroyed financially | Synonyms: broken, wiped out |
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| (adjective) poor enough to need help from others | Synonyms: destitute, indigent, necessitous, needy, poverty-stricken |
| improper | (adjective) not suitable or right or appropriate | - |
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| (adjective) not appropriate for a purpose or occasion | Synonyms: wrong |
| (adjective) not conforming to legality, moral law, or social convention | Synonyms: unconventional, unlawful |
| inadvertent | (adjective) happening by chance or unexpectedly or unintentionally | Synonyms: accidental |
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| inalterable | (adjective) not capable of being changed or altered | Synonyms: unalterable |
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| incertain | (adjective) lacking or indicating lack of confidence or assurance | Synonyms: uncertain, unsure |
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| incoherent | (adjective) without logical or meaningful connection | - |
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| (adjective) (physics) of waves having no stable definite or stable phase relation | - |
| (adjective) unable to express yourself clearly or fluently | Synonyms: tongue-tied |
| inconsiderable | (adjective) too small or unimportant to merit attention | - |
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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 |
| incontrovertible | (adjective) necessarily or demonstrably true | Synonyms: demonstrable |
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| (adjective) impossible to deny or disprove | Synonyms: irrefutable, positive |
| inconvertible | (adjective) used especially of currencies; incapable of being exchanged for or replaced by another currency of equal value | Synonyms: unconvertible, unexchangeable |
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| (adjective) not capable of being changed into something else | Synonyms: untransmutable |
| indecipherable | (adjective) not easily deciphered | Synonyms: unclear, undecipherable, unreadable |
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| (adjective) impossible to determine the meaning of | - |
| indeterminable | (adjective) not capable of being definitely decided or ascertained | Synonyms: undeterminable |
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| (adjective) incapable of being definitely ascertained or calculated | - |
| 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 | - |
| indifferent | (adjective) (usually followed by `to') unwilling or refusing to pay heed | Synonyms: deaf |
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| (adjective) characterized by a lack of partiality | Synonyms: unbiased, unbiassed |
| (adjective) fairly poor to not very good | - |
| (adjective) neither too great nor too little | - |
| (adjective) being neither good nor bad | Synonyms: so-so |
| (adjective) showing no care or concern in attitude or action | - |
| (adjective) (often followed by `to') lacking importance; not mattering one way or the other | Synonyms: immaterial |
| (adjective) marked by a lack of interest | Synonyms: apathetic |
| (adjective) having only a limited ability to react chemically; chemically inactive | Synonyms: inert, neutral |
| (adjective) marked by no especial liking or dislike or preference for one thing over another | - |
| indiscernible | (adjective) difficult or impossible to perceive or discern | - |
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| (adjective) barely able to be perceived | Synonyms: insensible, undetectable |
| ineradicable | (adjective) not able to be destroyed or rooted out | - |
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| inerrable | (adjective) not liable to error | Synonyms: inerrant, unerring |
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| inerrant | (adjective) not liable to error | Synonyms: inerrable, unerring |
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| inert | (adjective) slow and apathetic | Synonyms: sluggish, soggy, torpid |
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| (adjective) unable to move or resist motion | - |
| (adjective) having only a limited ability to react chemically; chemically inactive | Synonyms: indifferent, neutral |
| inertial | (adjective) of or relating to inertia | - |
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| inexperienced | (adjective) lacking practical experience or training | Synonyms: inexperient |
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| inexperient | (adjective) lacking practical experience or training | Synonyms: inexperienced |
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| inexpert | (adjective) lacking professional skill or expertise | Synonyms: amateur, amateurish, unskilled |
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| inexterminable | (adjective) incapable of extermination or extirpation | Synonyms: inextirpable |
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| inferential | (adjective) relating to or having the nature of illation or inference | Synonyms: illative |
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| (adjective) derived or capable of being derived by inference | - |
| (adjective) based on interpretation; not directly expressed | - |
| (adjective) of reasoning; proceeding from general premisses to a necessary and specific conclusion | - |
| (adjective) resembling or dependent on or arrived at by inference | Synonyms: illative |
| inferior | (adjective) written or printed below and to one side of another character | Synonyms: subscript |
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| (adjective) of or characteristic of low rank or importance | - |
| (adjective) of low or inferior quality | - |
| (adjective) having an orbit between the sun and the Earth's orbit | - |
| (adjective) lower than a given reference point | - |
| (adjective) falling short of some prescribed norm | Synonyms: deficient, substandard |
| infernal | (adjective) being of the underworld | - |
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| (adjective) characteristic of or resembling Hell | - |
| (adjective) of or pertaining to or characteristic of a very uncontrolled and intense fire | - |
| (adjective) expletives used informally as intensifiers | Synonyms: blame, blamed, blasted, blessed, damn, damned, darned, deuced, goddam, goddamn, goddamned |
| (adjective) extremely evil or cruel; expressive of cruelty or befitting hell | Synonyms: demonic, diabolic, diabolical, fiendish, hellish, satanic, unholy |
| infertile | (adjective) incapable of reproducing | Synonyms: sterile, unfertile |
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| inherent | (adjective) in the nature of something though not readily apparent | Synonyms: implicit in, underlying |
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| (adjective) existing as an essential constituent or characteristic | Synonyms: built-in, constitutional, inbuilt, integral |
| inheritable | (adjective) capable of being inherited | Synonyms: heritable |
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| inherited | (adjective) occurring among members of a family usually by heredity | Synonyms: familial, genetic, hereditary, transmissible, transmitted |
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| inheriting | (adjective) having the legal right to inherit | - |
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| inner | (adjective) located or occurring within or closer to a center | - |
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| (adjective) exclusive to a center; especially a center of influence | - |
| (adjective) inside or closer to the inside of the body | - |
| (adjective) innermost or essential | Synonyms: internal, intimate |
| (adjective) located inward | Synonyms: interior, internal |
| (adjective) confined to an exclusive group | Synonyms: inside, privileged |
| innermost | (adjective) situated or occurring farthest within | Synonyms: inmost |
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| (adjective) being deepest within the self | Synonyms: inmost |
| innumerable | (adjective) too numerous to be counted | Synonyms: countless, infinite, innumerous, multitudinous, myriad, numberless, uncounted, unnumberable, unnumbered, unnumerable |
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| innumerate | (adjective) lacking knowledge and understanding of mathematical concepts and methods | - |
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| innumerous | (adjective) too numerous to be counted | Synonyms: countless, infinite, innumerable, multitudinous, myriad, numberless, uncounted, unnumberable, unnumbered, unnumerable |
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| inoperable | (adjective) not suitable for surgery | - |
|---|
| (adjective) not able to perform its normal function | - |
| inoperative | (adjective) not working or taking effect | - |
|---|
| insincere | (adjective) lacking sincerity | - |
|---|
| insufferable | (adjective) unbearably arrogant or conceited | - |
|---|
| (adjective) too extreme to bear | Synonyms: unsufferable |
| insuperable | (adjective) incapable of being surmounted or excelled | Synonyms: unconquerable |
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| (adjective) impossible to surmount | Synonyms: insurmountable |
| intemperate | (adjective) excessive in behavior | - |
|---|
| (adjective) (of weather or climate) not mild; subject to extremes | - |
| (adjective) given to excessive indulgence of bodily appetites especially for intoxicating liquors | Synonyms: hard, heavy |
| interactional | (adjective) capable of acting on or influencing each other | Synonyms: interactive |
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| interactive | (adjective) used especially of drugs or muscles that work together so the total effect is greater than the sum of the two (or more) | Synonyms: synergistic |
|---|
| (adjective) capable of acting on or influencing each other | Synonyms: interactional |