| 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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| immortal | (adjective) not subject to death | - |
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| impartial | (adjective) showing lack of favoritism | - |
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| (adjective) free from undue bias or preconceived opinions | Synonyms: unprejudiced |
| 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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| important | (adjective) of great significance or value | Synonyms: of import |
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| (adjective) of extreme importance; vital to the resolution of a crisis | Synonyms: crucial |
| (adjective) important in effect or meaning | Synonyms: significant |
| (adjective) having or suggesting a consciousness of high position | - |
| (adjective) having authority or ascendancy or influence | Synonyms: authoritative |
| imported | (adjective) used of especially merchandise brought from a foreign source | - |
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| importunate | (adjective) persistent to the point of annoying | - |
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| (adjective) expressing persistant and earnest entreaty | - |
| inadvertent | (adjective) happening by chance or unexpectedly or unintentionally | Synonyms: accidental |
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| inarticulate | (adjective) without or deprived of the use of speech or words | Synonyms: unarticulate |
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| inartistic | (adjective) lacking aesthetic sensibility | Synonyms: unartistic |
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| incertain | (adjective) lacking or indicating lack of confidence or assurance | Synonyms: uncertain, unsure |
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| 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 |
| 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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| inexpert | (adjective) lacking professional skill or expertise | Synonyms: amateur, amateurish, unskilled |
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| infertile | (adjective) incapable of reproducing | Synonyms: sterile, unfertile |
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| inopportune | (adjective) not opportune | - |
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| insupportable | (adjective) incapable of being justified or explained | Synonyms: indefensible, unjustifiable, unwarrantable, unwarranted |
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| interdepartmental | (adjective) between or among departments | - |
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| intertidal | (adjective) of or relating to the littoral area above the low-tide mark | - |
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| intertribal | (adjective) between or among tribes | - |
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| intervertebral | (adjective) pertaining to the space between two vertebrae | - |
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| intradepartmental | (adjective) within a department | - |
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| introverted | (adjective) given to examining own sensory and perceptual experiences | Synonyms: introspective, self-examining |
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| introvertish | (adjective) somewhat introverted | Synonyms: shut-in |
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| introvertive | (adjective) directed inward; marked by interest in yourself or concerned with inner feelings | Synonyms: introversive |
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| invertebrate | (adjective) lacking a backbone or spinal column | Synonyms: spineless |
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| inverted | (adjective) (of a plant ovule) completely inverted; turned back 180 degrees on its stalk | Synonyms: anatropous |
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| (adjective) being in such a position that top and bottom are reversed | Synonyms: upside-down |
| invertible | (adjective) having an additive or multiplicative inverse | - |
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| kindhearted | (adjective) having or proceeding from an innately kind disposition | Synonyms: kind-hearted |
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| lacertilian | (adjective) of or relating to lizards | Synonyms: saurian |
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| libertine | (adjective) unrestrained by convention or morality | Synonyms: debauched, degenerate, degraded, dissipated, dissolute, fast, profligate, riotous |
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| lighthearted | (adjective) carefree and happy and lighthearted | Synonyms: blithe, blithesome, light-hearted, lightsome |
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| lionhearted | (adjective) extraordinarily courageous | - |
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| martial | (adjective) of or relating to the armed forces | - |
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| (adjective) suggesting war or military life | Synonyms: warlike |
| (adjective) (of persons) befitting a warrior | Synonyms: soldierlike, soldierly, warriorlike |
| mirthful | (adjective) arousing or provoking laughter | Synonyms: amusing, comic, comical, funny, laughable, risible |
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| (adjective) full of or showing high-spirited merriment | Synonyms: gay, jocund, jolly, jovial, merry |
| mirthless | (adjective) lacking mirth | - |
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| misfortunate | (adjective) deserving or inciting pity | Synonyms: hapless, miserable, pathetic, piteous, pitiable, pitiful, poor, wretched |
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| mortal | (adjective) subject to death | - |
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| (adjective) unrelenting and deadly | - |
| (adjective) involving loss of divine grace or spiritual death | Synonyms: deadly |
| (adjective) causing or capable of causing death | Synonyms: deadly, deathly |
| mortgaged | (adjective) burdened with legal or financial obligations | - |
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| mortified | (adjective) made to feel uncomfortable because of shame or wounded pride | Synonyms: embarrassed, humiliated |
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| (adjective) suffering from tissue death | Synonyms: gangrenous |
| mortifying | (adjective) causing awareness of your shortcomings | Synonyms: demeaning, humbling, humiliating |
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| (adjective) causing to feel shame or chagrin or vexation | Synonyms: embarrassing |
| mortuary | (adjective) of or relating to a funeral | - |
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| (adjective) of or relating to or characteristic of death | - |
| multipartite | (adjective) involving more than two parties | - |
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| neandertal | (adjective) ill-mannered and coarse and contemptible in behavior or appearance | Synonyms: boorish, loutish, neanderthal, oafish, swinish |
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| neanderthal | (adjective) ill-mannered and coarse and contemptible in behavior or appearance | Synonyms: boorish, loutish, neandertal, oafish, swinish |
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| neocortical | (adjective) of or relating to the neocortex of the cerebrum | - |
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| newsworthy | (adjective) sufficiently interesting to be reported in a newspaper | - |
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| nonassertive | (adjective) not aggressively self-assured, though not necessarily lacking in confidence | - |
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| nonparticulate | (adjective) not composed of distinct particles | - |
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| nonpartisan | (adjective) free from party affiliation or bias | Synonyms: nonpartizan |
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| nonpartizan | (adjective) free from party affiliation or bias | Synonyms: nonpartisan |
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| north | (adjective) situated in or facing or moving toward or coming from the north | - |
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| northbound | (adjective) moving toward the north | Synonyms: northward |
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| northeast | (adjective) situated in or oriented toward the northeast | Synonyms: northeasterly, northeastern |
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| (adjective) coming from the northeast | Synonyms: northeasterly |
| northeasterly | (adjective) situated in or oriented toward the northeast | Synonyms: northeast, northeastern |
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| (adjective) coming from the northeast | Synonyms: northeast |
| northeastern | (adjective) of a region of the United States generally including the New England states, New York, and sometimes New Jersey and Pennsylvania | - |
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| (adjective) situated in or oriented toward the northeast | Synonyms: northeast, northeasterly |
| northeastward | (adjective) toward the northeast | - |
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| northerly | (adjective) coming from the north; used especially of wind | Synonyms: northern |
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| (adjective) oriented toward the north | Synonyms: northern |
| northern | (adjective) situated in regions of the north | - |
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| (adjective) in or characteristic of a region of the United States north of (approximately) the Mason-Dixon line | - |
| (adjective) coming from the north; used especially of wind | Synonyms: northerly |
| (adjective) oriented toward the north | Synonyms: northerly |
| northernmost | (adjective) situated farthest north | Synonyms: northmost |
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| northmost | (adjective) situated farthest north | Synonyms: northernmost |
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| northward | (adjective) moving toward the north | Synonyms: northbound |
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| northwest | (adjective) situated in or oriented toward the northwest | Synonyms: northwesterly, northwestern |
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| (adjective) coming from the northwest | Synonyms: northwesterly |
| northwesterly | (adjective) situated in or oriented toward the northwest | Synonyms: northwest, northwestern |
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| (adjective) coming from the northwest | Synonyms: northwest |
| northwestern | (adjective) situated in or oriented toward the northwest | Synonyms: northwest, northwesterly |
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| (adjective) of a region of the United States generally including Washington, Oregon, Idaho, and sometimes Montana, Wyoming | - |
| northwestward | (adjective) toward the northwest | - |
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| noteworthy | (adjective) worthy of attention | Synonyms: notable, remarkable |
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| nurtural | (adjective) resulting from nurture | - |
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| nurturant | (adjective) providing physical and emotional care and nourishment | - |
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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 |
| opportune | (adjective) suitable or at a time that is suitable or advantageous especially for a particular purpose | - |
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| opportunist | (adjective) taking immediate advantage, often unethically, of any circumstance of possible benefit | Synonyms: opportunistic, timeserving |
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| opportunistic | (adjective) taking immediate advantage, often unethically, of any circumstance of possible benefit | Synonyms: opportunist, timeserving |
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| orthodontic | (adjective) of or relating to or involving or practicing orthodontics | - |
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| orthodox | (adjective) adhering to what is commonly accepted | - |
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| orthogonal | (adjective) not pertinent to the matter under consideration | Synonyms: extraneous, immaterial, impertinent |
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| (adjective) having a set of mutually perpendicular axes; meeting at right angles | Synonyms: rectangular |
| (adjective) statistically unrelated | - |
| orthographic | (adjective) of or relating to or expressed in orthography | - |
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| orthomolecular | (adjective) designating or relating to a form of treatment of mental disorders that seeks to restore biochemical balance in the body with large doses of vitamins and minerals | - |
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| orthopaedic | (adjective) of or relating to orthopedics | Synonyms: orthopedic, orthopedical |
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| orthopedic | (adjective) of or relating to orthopedics | Synonyms: orthopaedic, orthopedical |
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| orthopedical | (adjective) of or relating to orthopedics | Synonyms: orthopaedic, orthopedic |
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| orthoptic | (adjective) of or relating to normal binocular vision | - |
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| orthostatic | (adjective) pertaining to an upright standing posture | - |
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| orthotropous | (adjective) (of a plant ovule) completely straight with the micropyle at the apex | - |
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| overt | (adjective) open and observable; not secret or hidden | Synonyms: open |
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| overturned | (adjective) having been turned so that the bottom is no longer the bottom | Synonyms: upset, upturned |
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| paleocortical | (adjective) of or relating to the olfactory cortex of the cerebrum | - |
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| parted | (adjective) having a margin incised almost to the base so as to create distinct divisions or lobes | - |
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| parthenogenetic | (adjective) (of reproduction) not involving the fusion of male and female gametes in reproduction | Synonyms: agamic, agamogenetic, agamous, apomictic |
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| partial | (adjective) showing favoritism | - |
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| (adjective) constituting or comprising a part or fraction of a possible whole or entirety | Synonyms: fractional |
| (adjective) (followed by `of' or `to') having a strong preference or liking for | Synonyms: fond |
| (adjective) being or affecting only a part; not total | - |
| partible | (adjective) (of e.g. property) capable of being parted or divided | - |
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| participating | (adjective) taking part in an activity | Synonyms: active |
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| participatory | (adjective) affording the opportunity for individual participation | - |
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| participial | (adjective) of or relating to or consisting of participles | - |
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| particolored | (adjective) having sections or patches colored differently and usually brightly | Synonyms: calico, motley, multi-color, multi-colored, multi-colour, multi-coloured, multicolor, multicolored, multicolour, multicoloured, painted, particoloured, piebald, pied, varicolored, varicoloured |
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| particoloured | (adjective) having sections or patches colored differently and usually brightly | Synonyms: calico, motley, multi-color, multi-colored, multi-colour, multi-coloured, multicolor, multicolored, multicolour, multicoloured, painted, particolored, piebald, pied, varicolored, varicoloured |
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