| hydrophobic | (adjective) lacking affinity for water; tending to repel and not absorb water; tending not to dissolve in or mix with or be wetted by water | - |
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| (adjective) abnormally afraid of water | Synonyms: aquaphobic |
| hydrophytic | (adjective) growing wholly or partially in water | - |
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| hydroponic | (adjective) of or relating to aquiculture | Synonyms: aquacultural, aquicultural |
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| hygrophytic | (adjective) requiring an abundance of moisture | - |
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| hygroscopic | (adjective) absorbing moisture (as from the air) | - |
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| hymenopterous | (adjective) of or relating to insects of the order Hymenoptera | - |
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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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| 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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| hypophyseal | (adjective) of or relating to the hypophysis | Synonyms: hypophysial |
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| hypophysectomised | (adjective) having the pituitary gland removed by surgery | Synonyms: hypophysectomized |
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| hypophysectomized | (adjective) having the pituitary gland removed by surgery | Synonyms: hypophysectomised |
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| hypophysial | (adjective) of or relating to the hypophysis | Synonyms: hypophyseal |
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| idiopathic | (adjective) (of diseases) arising from an unknown cause | - |
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| 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 |
| 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 |
| inoperable | (adjective) not suitable for surgery | - |
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| (adjective) not able to perform its normal function | - |
| inoperative | (adjective) not working or taking effect | - |
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| inopportune | (adjective) not opportune | - |
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| interoperable | (adjective) able to exchange and use information | - |
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| isentropic | (adjective) with unchanging entropy; at constant entropy | - |
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| isopteran | (adjective) relating to or characteristic of insects of the order Isoptera | - |
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| isotopic | (adjective) of or relating to or having the relation of an isotope | - |
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| isotropic | (adjective) invariant with respect to direction | Synonyms: isotropous |
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| isotropous | (adjective) invariant with respect to direction | Synonyms: isotropic |
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| kaleidoscopic | (adjective) continually shifting or rapidly changing | Synonyms: kaleidoscopical |
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| kaleidoscopical | (adjective) continually shifting or rapidly changing | Synonyms: kaleidoscopic |
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| laryngopharyngeal | (adjective) of or relating to the larynx and pharynx | - |
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| lipophilic | (adjective) having an affinity for lipids | Synonyms: lipotropic |
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| lipotropic | (adjective) having an affinity for lipids | Synonyms: lipophilic |
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| lithophytic | (adjective) of or relating to lithophytes | - |
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| loopy | (adjective) consisting of or covered with or having loops | - |
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| (adjective) informal or slang terms for mentally irregular | Synonyms: around the bend, balmy, barmy, bats, batty, bonkers, buggy, cracked, crackers, daft, dotty, fruity, haywire, kookie, kooky, loco, loony, nuts, nutty, round the bend, wacky, whacky |
| lopsided | (adjective) having one side lower or smaller or lighter than the other | - |
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| (adjective) turned or twisted toward one side | Synonyms: askew, awry, cockeyed, skew-whiff, wonky |
| lyophilised | (adjective) used of tissue or blood or serum or other biological substances; dried by freezing in a high vacuum | Synonyms: freeze-dried, lyophilized |
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| lyophilized | (adjective) used of tissue or blood or serum or other biological substances; dried by freezing in a high vacuum | Synonyms: freeze-dried, lyophilised |
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| macroscopic | (adjective) large enough to be visible with the naked eye | Synonyms: macroscopical |
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| (adjective) visible to the naked eye; using the naked eye | Synonyms: macroscopical |
| macroscopical | (adjective) large enough to be visible with the naked eye | Synonyms: macroscopic |
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| (adjective) visible to the naked eye; using the naked eye | Synonyms: macroscopic |
| malapropos | (adjective) of an inappropriate or incorrectly applied nature | - |
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| mecopterous | (adjective) of or relating to mecopterans | - |
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| megascopic | (adjective) visible to the naked eye (especially of rocks and anatomical features) | Synonyms: gross |
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| menopausal | (adjective) of or relating to the menopause | - |
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| mephistophelean | (adjective) showing the cunning or ingenuity or wickedness typical of a devil | Synonyms: devilish, diabolic, diabolical, mephistophelian |
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| mephistophelian | (adjective) showing the cunning or ingenuity or wickedness typical of a devil | Synonyms: devilish, diabolic, diabolical, mephistophelean |
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| mesophytic | (adjective) being or growing in or adapted to a moderately moist environment | - |
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| metropolitan | (adjective) relating to or characteristic of a metropolis | - |
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| micropylar | (adjective) of or relating to a micropyle | - |
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| microscopic | (adjective) of or relating to or used in microscopy | Synonyms: microscopical |
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| (adjective) extremely precise with great attention to details | - |
| (adjective) so small as to be invisible without a microscope | Synonyms: microscopical |
| (adjective) visible under a microscope; using a microscope | Synonyms: microscopical |
| microscopical | (adjective) of or relating to or used in microscopy | Synonyms: microscopic |
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| (adjective) so small as to be invisible without a microscope | Synonyms: microscopic |
| (adjective) visible under a microscope; using a microscope | Synonyms: microscopic |
| misanthropic | (adjective) believing the worst of human nature and motives; having a sneering disbelief in e.g. selflessness of others | Synonyms: cynical, misanthropical |
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| (adjective) hating mankind in general | Synonyms: misanthropical |
| misanthropical | (adjective) believing the worst of human nature and motives; having a sneering disbelief in e.g. selflessness of others | Synonyms: cynical, misanthropic |
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| (adjective) hating mankind in general | Synonyms: misanthropic |
| misappropriated | (adjective) taken for your own use in violation of a trust | Synonyms: embezzled |
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| monophonic | (adjective) consisting of a single melodic line | - |
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| (adjective) designating sound transmission or recording or reproduction over a single channel | Synonyms: mono, single-channel |
| monoploid | (adjective) of a cell or organism having a single set of chromosomes | Synonyms: haploid, haploidic |
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| monopolistic | (adjective) having exclusive control over a commercial activity by possession or legal grant | - |
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| monopteral | (adjective) having circular columniation | - |
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| morphophonemic | (adjective) of or relating to morphophonemics | - |
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| mucopurulent | (adjective) containing or composed of mucus and pus | - |
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| myopathic | (adjective) of or relating to any disease of the muscles that is not caused by nerve dysfunction | - |
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| myopic | (adjective) unable to see distant objects clearly | Synonyms: nearsighted, shortsighted |
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| (adjective) lacking foresight or scope | Synonyms: short, shortsighted, unforesightful |
| myrmecophagous | (adjective) feeding on ants | - |
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| myrmecophilous | (adjective) living symbiotically with ants | - |
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| myrmecophytic | (adjective) of or relating to myrmecophytes | - |
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| mysophobic | (adjective) suffering from mysophobia; abnormally afraid of dirt or contamination | - |
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| nasopharyngeal | (adjective) of or relating to or located near the nasopharynx | - |
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| neoplastic | (adjective) of or related to or having the properties of a neoplasm | - |
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| neurophysiological | (adjective) of or concerned with neurophysiology | - |
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| neuropsychiatric | (adjective) of or relating to neuropsychiatry | - |
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| neuropsychological | (adjective) of or concerned with neuropsychology | - |
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| neurotropic | (adjective) (of a virus, toxin, or chemical) tending to attack or affect the nervous system preferentially | - |
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| nonopening | (adjective) not open; not opening | - |
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| nonoperational | (adjective) (military) not involved in military operations | Synonyms: inactive |
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| nonproprietary | (adjective) not protected by trademark or patent or copyright | - |
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| nonstop | (adjective) at all times | Synonyms: around-the-clock, day-and-night, round-the-clock |
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| (adjective) (of a journey especially a flight) occurring without stops | - |
| nontelescopic | (adjective) not telescopic | Synonyms: nontelescoping |
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| nontelescoping | (adjective) not telescopic | Synonyms: nontelescopic |
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| oleophilic | (adjective) having a strong affinity for oils rather than water | - |
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| oleophobic | (adjective) lacking affinity for oils | - |
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| onomatopoeic | (adjective) (of words) formed in imitation of a natural sound | Synonyms: echoic, imitative, onomatopoeical, onomatopoetic |
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| (adjective) of or relating to or characterized by onomatopoeia | Synonyms: onomatopoetic |
| onomatopoeical | (adjective) (of words) formed in imitation of a natural sound | Synonyms: echoic, imitative, onomatopoeic, onomatopoetic |
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| onomatopoetic | (adjective) (of words) formed in imitation of a natural sound | Synonyms: echoic, imitative, onomatopoeic, onomatopoeical |
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| (adjective) of or relating to or characterized by onomatopoeia | Synonyms: onomatopoeic |
| opalescent | (adjective) having a play of lustrous rainbow colors | Synonyms: iridescent, nacreous, opaline, pearlescent |
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| opaline | (adjective) having a play of lustrous rainbow colors | Synonyms: iridescent, nacreous, opalescent, pearlescent |
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| opaque | (adjective) not transmitting or reflecting light or radiant energy; impenetrable to sight | - |
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| (adjective) hard or impossible to understand | Synonyms: unintelligible |
| open | (adjective) ready or willing to receive favorably | Synonyms: receptive |
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| (adjective) affording unobstructed entrance and exit; not shut or closed | Synonyms: unfastened |
| (adjective) affording free passage or access | - |
| (adjective) (set theory) of an interval that contains neither of its endpoints | - |
| (adjective) open and observable; not secret or hidden | Synonyms: overt |
| (adjective) used of mouth or eyes | Synonyms: opened |
| (adjective) ready for business | - |
| (adjective) not having been filled | - |
| (adjective) (of textures) full of small openings or gaps | Synonyms: loose |
| (adjective) openly straightforward and direct without reserve or secretiveness | Synonyms: candid, heart-to-heart |
| (adjective) not requiring union membership | - |
| (adjective) open to or in view of all | - |
| (adjective) possibly accepting or permitting | Synonyms: capable, subject |
| (adjective) without undue constriction as from e.g. tenseness or inhibition | - |
| (adjective) having no protecting cover or enclosure | - |
| (adjective) affording free passage or view | Synonyms: clear |
| (adjective) with no protection or shield | Synonyms: exposed |
| (adjective) accessible to all | - |
| (adjective) not sealed or having been unsealed | Synonyms: opened |
| (adjective) not brought to a conclusion; subject to further thought | Synonyms: undecided, undetermined, unresolved |
| (adjective) not defended or capable of being defended | Synonyms: assailable, undefendable, undefended |
| opencast | (adjective) (of mines and mining) worked from the exposed surface | Synonyms: opencut |
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| opencut | (adjective) (of mines and mining) worked from the exposed surface | Synonyms: opencast |
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| opened | (adjective) used of mouth or eyes | Synonyms: open |
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| (adjective) made open or clear | - |
| (adjective) not sealed or having been unsealed | Synonyms: open |
| openhanded | (adjective) given or giving freely | Synonyms: big, bighearted, bounteous, bountiful, freehanded, giving, handsome, liberal |
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| openhearted | (adjective) freely communicative; candidly straightforward | - |
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| (adjective) showing or motivated by sympathy and understanding and generosity | Synonyms: benevolent, charitable, good-hearted, kindly, large-hearted, sympathetic |
| opening | (adjective) first or beginning | - |
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| openmouthed | (adjective) with eyes or mouth open in surprise | Synonyms: goggle-eyed, popeyed |
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| operable | (adjective) capable of being treated by surgical operation | - |
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| (adjective) usable for a specific purpose | Synonyms: practicable |
| (adjective) fit or ready for use or service | Synonyms: functional, operational, usable, useable |
| operant | (adjective) having influence or producing an effect | - |
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| operatic | (adjective) of or relating to or characteristic of opera | - |
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| operating | (adjective) involved in a kind of operation | - |
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| (adjective) being in effect or operation | Synonyms: in operation, operational |
| operational | (adjective) (military) of or intended for or involved in military operations | - |
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| (adjective) pertaining to a process or series of actions for achieving a result | - |
| (adjective) being in effect or operation | Synonyms: in operation, operating |
| (adjective) fit or ready for use or service | Synonyms: functional, operable, usable, useable |
| operationalist | (adjective) of or relating to or espousing operationalism | - |
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| operative | (adjective) being in force or having or exerting force | - |
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| (adjective) relating to or requiring or amenable to treatment by surgery especially as opposed to medicine | Synonyms: surgical |
| (adjective) (of e.g. a machine) performing or capable of performing | Synonyms: functional, running, working |
| (adjective) effective; producing a desired effect | - |
| operculate | (adjective) having an operculum | Synonyms: operculated |
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| operculated | (adjective) having an operculum | Synonyms: operculate |
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