| heal | (verb) get healthy again | - |
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| (verb) provide a cure for, make healthy again | Synonyms: bring around, cure |
| (verb) heal or recover | Synonyms: mend |
| hebdomadal | (adjective) of or occurring every seven days | Synonyms: hebdomadary, weekly |
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| heliacal | (adjective) pertaining to or near the sun; especially the first rising of a star after and last setting before its invisibility owing to its conjunction with the sun | Synonyms: heliac |
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| helical | (adjective) in the shape of a coil | Synonyms: coiling, spiral, spiraling, spiralling, turbinate, volute, voluted, whorled |
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| hemal | (adjective) relating to the blood vessels or blood | Synonyms: haemal, haematal, hematal |
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| hematal | (adjective) relating to the blood vessels or blood | Synonyms: haemal, haematal, hemal |
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| hematological | (adjective) of or relating to or involved in hematology | Synonyms: haematological, hematologic |
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| hemiacetal | (noun) an organic compound usually formed as an intermediate product in the preparation of acetals from aldehydes or ketones | - |
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| hemispherical | (adjective) of or relating to or being a hemisphere | - |
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| herbal | (adjective) of or relating to herbs | - |
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| (noun) tea-like drink made of leaves of various herbs | Synonyms: herb tea, herbal tea |
| heretical | (adjective) characterized by departure from accepted beliefs or standards | Synonyms: dissident, heterodox |
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| hermitical | (adjective) characterized by ascetic solitude | Synonyms: anchoritic, eremitic, eremitical, hermitic |
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| heroical | (adjective) having or displaying qualities appropriate for heroes | Synonyms: heroic |
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| heterocercal | (adjective) possessing a tail with the upper lobe larger than the lower and with the vertebral column prolonged into the upper lobe | - |
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| heterological | (adjective) not corresponding in structure or evolutionary origin | Synonyms: heterologic, heterologous |
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| heterosexual | (adjective) sexually attracted to members of the opposite sex | - |
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| (noun) a person having a sexual orientation to persons of the opposite sex | Synonyms: heterosexual person, straight, straight person |
| hexadecimal | (adjective) of or pertaining to a number system having 16 as its base | Synonyms: hex |
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| hexagonal | (adjective) having six sides or divided into hexagons | Synonyms: hexangular |
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| hibernal | (adjective) characteristic of or relating to winter | Synonyms: brumal, hiemal |
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| hiemal | (adjective) characteristic of or relating to winter | Synonyms: brumal, hibernal |
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| hierarchal | (adjective) classified according to various criteria into successive levels or layers | Synonyms: hierarchic, hierarchical |
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| hierarchical | (adjective) classified according to various criteria into successive levels or layers | Synonyms: hierarchal, hierarchic |
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| hieratical | (adjective) associated with the priesthood or priests | Synonyms: hieratic, priestly, sacerdotal |
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| hieroglyphical | (adjective) written in or belonging to a writing system using pictorial symbols | Synonyms: hieroglyphic |
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| (adjective) resembling hieroglyphic writing | Synonyms: hieroglyphic |
| histological | (adjective) of or relating to histology | Synonyms: histologic |
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| historical | (adjective) used of the study of a phenomenon (especially language) as it changes through time | Synonyms: diachronic |
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| (adjective) of or relating to the study of history | - |
| (adjective) belonging to the past; of what is important or famous in the past | Synonyms: historic |
| (adjective) having once lived or existed or taken place in the real world as distinct from being legendary | - |
| holographical | (adjective) written entirely in one's own hand | Synonyms: holographic |
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| homicidal | (adjective) characteristic of or capable of or having a tendency toward killing another human being | Synonyms: murderous |
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| homiletical | (adjective) of or relating to homiletics | Synonyms: homiletic |
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| (adjective) of the nature of a homily or sermon | Synonyms: homiletic |
| hominal | (adjective) of humankind as a species | - |
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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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| homological | (adjective) similar in evolutionary origin but not in function | Synonyms: homologic |
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| homosexual | (adjective) sexually attracted to members of your own sex | - |
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| (noun) someone who is sexually attracted to persons of the same sex | Synonyms: gay, homo, homophile |
| horizontal | (adjective) parallel to or in the plane of the horizon or a base line | - |
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| (noun) something that is oriented horizontally | - |
| hormonal | (adjective) of or relating to or caused by hormones | - |
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| horticultural | (adjective) of or relating to the cultivation of plants | - |
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| hospital | (noun) a health facility where patients receive treatment | Synonyms: infirmary |
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| (noun) a medical institution where sick or injured people are given medical or surgical care | - |
| humoral | (adjective) of or relating to bodily fluids | - |
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| hydrographical | (adjective) of or relating to the science of hydrography | Synonyms: hydrographic |
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| hygienical | (adjective) tending to promote or preserve health | Synonyms: hygienic |
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| hymenal | (adjective) of or relating to the hymen | - |
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| hymeneal | (adjective) of or relating to a wedding or marriage | - |
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| (noun) a wedding hymn | - |
| hymnal | (noun) a songbook containing a collection of hymns | Synonyms: hymnary, hymnbook |
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| hypaethral | (adjective) partly or entirely open to the sky | Synonyms: hypethral |
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| hyperboloidal | (adjective) having the shape of a hyperboloid | - |
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| hypercritical | (adjective) inclined to judge too severely | Synonyms: overcritical |
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| hyperthermal | (adjective) of or relating to or affected by hyperthermia | - |
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| hypethral | (adjective) partly or entirely open to the sky | Synonyms: hypaethral |
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| hypochondriacal | (adjective) suffering from hypochondria | Synonyms: hypochondriac |
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| hypocritical | (adjective) professing feelings or virtues one does not have | - |
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| hypodermal | (adjective) of or relating to the hypodermis | - |
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| hypoglossal | (noun) supplies intrinsic muscles of the tongue and other tongue muscles | Synonyms: hypoglossal nerve, nervus hypoglosus, twelfth cranial nerve |
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| hypophyseal | (adjective) of or relating to the hypophysis | Synonyms: hypophysial |
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| hypophysial | (adjective) of or relating to the hypophysis | Synonyms: hypophyseal |
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| hypothetical | (adjective) based primarily on surmise rather than adequate evidence | Synonyms: conjectural, divinatory, hypothetic, supposed, suppositional, suppositious, supposititious |
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| (noun) a hypothetical possibility, circumstance, statement, proposal, situation, etc. | - |
| hysterical | (adjective) marked by excessive or uncontrollable emotion | - |
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| (adjective) characterized by or arising from psychoneurotic hysteria | Synonyms: hysteric |
| icosahedral | (adjective) of or relating to an icosahedron | - |
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| ictal | (adjective) of or relating to a seizure or convulsion | Synonyms: ictic |
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| ideal | (adjective) of or relating to the philosophical doctrine of the reality of ideas | Synonyms: idealistic |
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| (adjective) constituting or existing only in the form of an idea or mental image or conception | - |
| (adjective) conforming to an ultimate standard of perfection or excellence; embodying an ideal | - |
| (noun) the idea of something that is perfect; something that one hopes to attain | - |
| (noun) model of excellence or perfection of a kind; one having no equal | Synonyms: apotheosis, nonesuch, nonpareil, nonsuch, paragon, saint |
| ideational | (adjective) being of the nature of a notion or concept | Synonyms: conceptional, notional |
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| identical | (adjective) (of twins) derived from a single egg or ovum | Synonyms: monovular |
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| (adjective) coinciding exactly when superimposed | Synonyms: superposable |
| (adjective) having properties with uniform values along all axes | - |
| (adjective) exactly alike; incapable of being perceived as different | Synonyms: indistinguishable |
| (adjective) being the exact same one; not any other: | Synonyms: selfsame, very |
| ideological | (adjective) of or pertaining to or characteristic of an orientation that characterizes the thinking of a group or nation | - |
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| (adjective) concerned with or suggestive of ideas | Synonyms: ideologic |
| idiomatical | (adjective) of or relating to or conforming to idiom | Synonyms: idiomatic |
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| illegal | (adjective) prohibited by law or by official or accepted rules | - |
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| illiberal | (adjective) narrow-minded about cherished opinions | Synonyms: intolerant |
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| illogical | (adjective) lacking in correct logical relation | Synonyms: unlogical |
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| (adjective) lacking orderly continuity | Synonyms: confused, disconnected, disjointed, disordered, garbled, scattered, unconnected |
| illusional | (adjective) marked by or producing illusion | Synonyms: illusionary |
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| 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 |
| immemorial | (adjective) long past; beyond the limits of memory or tradition or recorded history | - |
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| immoral | (adjective) deliberately violating accepted principles of right and wrong | - |
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| (adjective) not adhering to ethical or moral principles | Synonyms: base |
| immortal | (adjective) not subject to death | - |
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| (noun) any supernatural being worshipped as controlling some part of the world or some aspect of life or who is the personification of a force | Synonyms: deity, divinity, god |
| (noun) a person (such as an author) of enduring fame | - |
| immunochemical | (adjective) of or relating to immunochemistry | - |
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| immunological | (adjective) of or relating to immunology | Synonyms: immunologic |
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| impartial | (adjective) showing lack of favoritism | - |
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| (adjective) free from undue bias or preconceived opinions | Synonyms: unprejudiced |
| 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 |
| (noun) a piece of luggage carried on top of a coach | - |
| (noun) a small tufted beard worn by Emperor Napoleon III | Synonyms: imperial beard |
| impersonal | (adjective) not relating to or responsive to individual persons | - |
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| (adjective) having no personal preference | Synonyms: neutral |
| implemental | (adjective) serving or acting as a means or aid | Synonyms: instrumental, subservient |
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| implicational | (adjective) relating to or concerned with logical implication | - |
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| impractical | (adjective) not practical; not workable or not given to practical matters | - |
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| (adjective) not practical or realizable; speculative | Synonyms: airy, Laputan, visionary, windy |
| inaugural | (adjective) occurring at or characteristic of a formal investiture or induction | - |
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| (adjective) serving to set in motion | Synonyms: first, initiative, initiatory, maiden |
| (noun) the ceremonial induction into a position | Synonyms: inauguration |
| (noun) an address delivered at an inaugural ceremony (especially by a United States president) | Synonyms: inaugural address |
| incidental | (adjective) (sometimes followed by `to') minor or casual or subordinate in significance or nature or occurring as a chance concomitant or consequence | Synonyms: incident |
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| (adjective) not of prime or central importance | Synonyms: accidental, nonessential |
| (adjective) occurring with or following as a consequence | Synonyms: accompanying, attendant, collateral, concomitant, consequent, ensuant, resultant, sequent |
| (noun) an item that is incidental | - |
| (noun) (frequently plural) an expense not budgeted or not specified | Synonyms: incidental expense, minor expense |
| inconsequential | (adjective) not following logically as a consequence | - |
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| (adjective) lacking worth or importance | Synonyms: inconsequent |
| incorporeal | (adjective) without material form or substance | Synonyms: immaterial |
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| incremental | (adjective) increasing gradually by regular degrees or additions | - |
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| indexical | (adjective) of or relating to or serving as an index | - |
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| individual | (adjective) being or characteristic of a single thing or person | Synonyms: single |
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| (adjective) separate and distinct from others of the same kind | Synonyms: case-by-case, item-by-item |
| (adjective) concerning one person exclusively | Synonyms: private |
| (adjective) characteristic of or meant for a single person or thing | Synonyms: single |
| (noun) a human being; person, singular, assertive existential pronoun; pronoun, person, singular; quantifier: assertive existential | Synonyms: mortal, person, somebody, someone, soul |
| (noun) a single organism | - |
| indusial | (adjective) of or relating to or being an indusium | - |
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| industrial | (adjective) having highly developed industries | - |
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| (adjective) of or relating to or resulting from industry | - |
| (adjective) employed in industry | - |
| (adjective) suitable to stand up to hard wear | - |
| ineffectual | (adjective) not producing an intended effect | Synonyms: ineffective, uneffective |
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| (adjective) lacking in power or forcefulness | Synonyms: ineffective, unable |
| (adjective) producing no result or effect | Synonyms: futile, meaningless, otiose, unavailing |
| inertial | (adjective) of or relating to inertia | - |
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| inessential | (adjective) not basic or fundamental | Synonyms: unessential |
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| (adjective) not absolutely necessary | - |
| (noun) anything that is not essential | Synonyms: nonessential |
| 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 |
| 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 |
| (noun) an inhabitant of Hell | - |
| infinitesimal | (adjective) infinitely or immeasurably small | Synonyms: minute |
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| (noun) (mathematics) a variable that has zero as its limit | - |
| infinitival | (adjective) relating to or formed with the infinitive | - |
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| inflectional | (adjective) characterized by inflections indicating grammatical distinctions | - |
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| influential | (adjective) having or exercising influence or power | - |
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| infomercial | (noun) a television commercial presented in the form of a short documentary | Synonyms: informercial |
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| informal | (adjective) not formal | - |
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| (adjective) used of spoken and written language | - |
| (adjective) having or fostering a warm or friendly and informal atmosphere | Synonyms: cosy, cozy, intimate |
| (adjective) not officially recognized or controlled | Synonyms: loose |
| informational | (adjective) relating to or having the nature of information | - |
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