| angiospermous | (adjective) of or related to or characteristic of plants that are angiosperms | - |
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| anoperineal | (adjective) relating to the anus and surrounding perineum | - |
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| antipersonnel | (adjective) designed to inflict death or personal injury rather than material destruction | - |
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| aperient | (adjective) mildly laxative | - |
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| aperiodic | (adjective) not recurring at regular intervals | Synonyms: nonperiodic |
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| apperceptive | (adjective) able to relate new percepts to past experience | - |
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| chipper | (adjective) having a cheerful, lively, and self-confident air | Synonyms: debonair, debonaire, jaunty |
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| cooperative | (adjective) done with or working with others for a common purpose or benefit | - |
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| (adjective) involving the joint activity of two or more | Synonyms: concerted, conjunct, conjunctive, united |
| (adjective) willing to adjust to differences in order to obtain agreement | Synonyms: accommodative |
| coppery | (adjective) of something having the color of copper | Synonyms: copper colored |
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| dapper | (adjective) marked by up-to-dateness in dress and manners | Synonyms: dashing, jaunty, natty, raffish, rakish, snappy, spiffy, spruce |
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| desperate | (adjective) showing extreme courage; especially of actions courageously undertaken in desperation as a last resort | Synonyms: heroic |
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| (adjective) fraught with extreme danger; nearly hopeless | Synonyms: dire |
| (adjective) arising from or marked by despair or loss of hope | Synonyms: despairing |
| (adjective) showing extreme urgency or intensity especially because of great need or desire | - |
| (adjective) desperately determined | Synonyms: do-or-die |
| (adjective) (of persons) dangerously reckless or violent as from urgency or despair | - |
| dispersed | (adjective) distributed or spread over a considerable extent | Synonyms: spread |
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| dispersive | (adjective) spreading by diffusion | Synonyms: diffusing, diffusive, disseminative |
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| exasperated | (adjective) greatly annoyed; out of patience | Synonyms: browned off, cheesed off |
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| exasperating | (adjective) extremely annoying or displeasing | Synonyms: infuriating, maddening, vexing |
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| (adjective) making worse | Synonyms: aggravating, exacerbating |
| experienced | (adjective) having experience; having knowledge or skill from observation or participation | Synonyms: experient |
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| experient | (adjective) having experience; having knowledge or skill from observation or participation | Synonyms: experienced |
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| experiential | (adjective) relating to or resulting from experience | - |
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| (adjective) derived from experience or the experience of existence | Synonyms: existential |
| experimental | (adjective) relating to or based on experiment | - |
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| (adjective) relying on observation or experiment | Synonyms: data-based, observational |
| (adjective) of the nature of or undergoing an experiment | - |
| expert | (adjective) having or showing knowledge and skill and aptitude | Synonyms: adept, good, practiced, proficient, skilful, skillful |
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| (adjective) of or relating to or requiring special knowledge to be understood | Synonyms: technical |
| gymnospermous | (adjective) relating to or characteristic of plants of the class Gymnospermae | - |
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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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| 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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| 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 |
| 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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| 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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| 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 | - |
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| (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 |
| interoperable | (adjective) able to exchange and use information | - |
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| interpersonal | (adjective) occurring among or involving several people | - |
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| nonoperational | (adjective) (military) not involved in military operations | Synonyms: inactive |
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| nonperiodic | (adjective) not recurring at regular intervals | Synonyms: aperiodic |
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| nonpersonal | (adjective) lacking personality | - |
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| nonslippery | (adjective) not slippery; not likely to slip or skid | - |
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| obstreperous | (adjective) boisterously and noisily aggressive | - |
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| (adjective) noisily and stubbornly defiant | - |
| 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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| operose | (adjective) characterized by effort to the point of exhaustion; especially physical effort | Synonyms: arduous, backbreaking, grueling, gruelling, hard, heavy, laborious, punishing, toilsome |
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| pampering | (adjective) gratifying tastes, appetites, or desires | - |
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| paperback | (adjective) (of books) having a flexible binding | Synonyms: paperbacked |
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| paperbacked | (adjective) (of books) having a flexible binding | Synonyms: paperback |
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| paperlike | (adjective) of or like paper | Synonyms: chartaceous, papery |
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| papery | (adjective) of or like paper | Synonyms: chartaceous, paperlike |
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| (adjective) thin and paperlike | - |
| peppery | (adjective) having the piquant burning taste of peppers | - |
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| perambulating | (adjective) strolling or walking around | - |
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| perceivable | (adjective) capable of being apprehended or understood | Synonyms: apprehensible, graspable, intelligible, understandable |
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| (adjective) capable of being perceived especially by sight or hearing | - |
| perceived | (adjective) detected by means of the senses | - |
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| (adjective) detected by instinct or inference rather than by recognized perceptual cues | Synonyms: sensed |
| perceptible | (adjective) capable of being perceived by the mind or senses | - |
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| (adjective) easily seen or detected | Synonyms: detectable |
| perceptive | (adjective) having the ability to perceive or understand; keen in discernment | - |
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| (adjective) of or relating to perception | - |
| perceptual | (adjective) of or relating to the act of perceiving | - |
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| percipient | (adjective) characterized by ease and quickness in perceiving | Synonyms: clear |
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| percussive | (adjective) involving percussion or featuring percussive instruments | - |
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| percutaneous | (adjective) through the unbroken skin; refers to medications applied directly to the skin (creams or ointments) or in time-release forms (skin patches) | Synonyms: transcutaneous, transdermal, transdermic |
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| perdurable | (adjective) very long lasting | Synonyms: durable, indestructible, undestroyable |
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| peregrine | (adjective) migratory | Synonyms: mobile, nomadic, roving, wandering |
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| peremptory | (adjective) putting an end to all debate or action | - |
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| (adjective) offensively self-assured or given to exercising usually unwarranted power | Synonyms: autocratic, bossy, dominating, high-and-mighty, magisterial |
| (adjective) not allowing contradiction or refusal | - |
| perennial | (adjective) lasting three seasons or more | - |
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| (adjective) recurring again and again | Synonyms: recurrent, repeated |
| (adjective) lasting an indefinitely long time; suggesting self-renewal | - |
| perfect | (adjective) being complete of its kind and without defect or blemish | - |
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| (adjective) precisely accurate or exact | - |
| (adjective) without qualification; used informally as (often pejorative) intensifiers | Synonyms: arrant, complete, consummate, double-dyed, everlasting, gross, pure, sodding, staring, stark, thorough, thoroughgoing, unadulterated, utter |