| operant | (adjective) having influence or producing an effect | - |
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| opponent | (adjective) characterized by active hostility | Synonyms: opposing |
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| opulent | (adjective) ostentatiously rich and superior in quality | Synonyms: deluxe, gilded, grand, lush, luxurious, princely, sumptuous |
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| oscitant | (adjective) showing lack of attention or boredom | Synonyms: drowsy, yawning |
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| overabundant | (adjective) excessively abundant | Synonyms: plethoric, rife |
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| overconfident | (adjective) marked by excessive confidence | Synonyms: cocksure, positive |
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| overindulgent | (adjective) excessively indulgent | - |
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| overvaliant | (adjective) having or showing undue valor or boldness | - |
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| palpitant | (adjective) having a slight and rapid trembling motion | Synonyms: palpitating |
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| paramount | (adjective) having superior power and influence | Synonyms: overriding, predominant, predominate, preponderant, preponderating |
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| parturient | (adjective) of or relating to or giving birth | - |
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| (adjective) giving birth | - |
| passant | (adjective) in walking position with right foreleg raised | - |
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| patent | (adjective) clearly revealed to the mind or the senses or judgment | Synonyms: apparent, evident, manifest, palpable, plain, unmistakable |
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| (adjective) (of a bodily tube or passageway) open; affording free passage | - |
| patient | (adjective) enduring trying circumstances with even temper or characterized by such endurance | - |
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| pearlescent | (adjective) having a play of lustrous rainbow colors | Synonyms: iridescent, nacreous, opalescent, opaline |
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| peccant | (adjective) liable to sin | Synonyms: peccable |
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| pendant | (adjective) held from above and hanging down | Synonyms: dependent, pendent |
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| pendent | (adjective) held from above and hanging down | Synonyms: dependent, pendant |
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| penitent | (adjective) feeling or expressing remorse for misdeeds | Synonyms: repentant |
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| pent | (adjective) closely confined | Synonyms: shut up |
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| pentavalent | (adjective) having a valence of five | - |
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| percipient | (adjective) characterized by ease and quickness in perceiving | Synonyms: clear |
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| permanent | (adjective) continuing or enduring without marked change in status or condition or place | Synonyms: lasting |
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| (adjective) not capable of being reversed or returned to the original condition | - |
| permeant | (adjective) spreading or spread throughout | Synonyms: permeating, permeative, pervasive |
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| persistent | (adjective) retained; not shed | Synonyms: lasting |
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| (adjective) never-ceasing | Synonyms: relentless, unrelenting |
| (adjective) stubbornly unyielding | Synonyms: dogged, dour, pertinacious, tenacious, unyielding |
| (adjective) continually recurring to the mind | Synonyms: haunting |
| pertinent | (adjective) being of striking appropriateness and pertinence | Synonyms: apposite, apt |
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| (adjective) having precise or logical relevance to the matter at hand | Synonyms: to the point |
| pestilent | (adjective) likely to spread and cause an epidemic disease | Synonyms: pestiferous, pestilential, plaguey |
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| (adjective) exceedingly harmful | Synonyms: baneful, deadly, pernicious |
| petulant | (adjective) easily irritated or annoyed | Synonyms: cranky, fractious, irritable, nettlesome, peckish, peevish, pettish, scratchy, techy, testy, tetchy |
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| phosphorescent | (adjective) emitting light without appreciable heat as by slow oxidation of phosphorous | - |
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| piquant | (adjective) attracting or delighting | Synonyms: engaging |
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| (adjective) engagingly stimulating or provocative | Synonyms: salty |
| (adjective) having an agreeably pungent taste | Synonyms: savory, savoury, zesty |
| plangent | (adjective) loud and resounding | - |
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| pleasant | (adjective) affording pleasure; being in harmony with your taste or likings | - |
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| (adjective) (of persons) having pleasing manners or behavior | - |
| pliant | (adjective) able to adjust readily to different conditions | Synonyms: elastic, flexible, pliable |
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| (adjective) capable of being bent or flexed or twisted without breaking | Synonyms: bendable, pliable, waxy |
| (adjective) capable of being shaped or bent or drawn out | Synonyms: ductile, malleable, pliable, tensile, tractile |
| (adjective) capable of being influenced or formed | Synonyms: plastic |
| poignant | (adjective) arousing affect | Synonyms: affecting, touching |
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| (adjective) keenly distressing to the mind or feelings | - |
| polyvalent | (adjective) having more than one valence, or having a valence of 3 or higher | Synonyms: multivalent |
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| (adjective) containing several antibodies each capable of counteracting a specific antigen | - |
| potent | (adjective) having a strong physiological or chemical effect | Synonyms: stiff, strong |
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| (adjective) (of a male) capable of copulation | Synonyms: virile |
| (adjective) having great influence | Synonyms: powerful |
| (adjective) having or wielding force or authority | Synonyms: strong |
| preadolescent | (adjective) of or relating to or designed for children between the ages of 9 and 12 | Synonyms: preteen |
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| precedent | (adjective) preceding in time, order, or significance | - |
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| precipitant | (adjective) done with very great haste and without due deliberation | Synonyms: hasty, overhasty, precipitate, precipitous |
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| predominant | (adjective) having superior power and influence | Synonyms: overriding, paramount, predominate, preponderant, preponderating |
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| (adjective) most frequent or common | Synonyms: dominant, prevailing, prevalent, rife |
| preeminent | (adjective) greatest in importance or degree or significance or achievement | Synonyms: leading |
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| preexistent | (adjective) existing previously or before something | Synonyms: pre-existent, pre-existing, preexisting |
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| preferent | (adjective) preferred above all others and treated with partiality | Synonyms: best-loved, favored, favorite, favoured, favourite, pet, preferred |
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| pregnant | (adjective) carrying developing offspring within the body or being about to produce new life | - |
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| (adjective) filled with or attended with | Synonyms: fraught |
| (adjective) rich in significance or implication | Synonyms: meaning, significant |
| preponderant | (adjective) having superior power and influence | Synonyms: overriding, paramount, predominant, predominate, preponderating |
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| prepubescent | (adjective) (especially of human beings) at the age immediately before puberty; often marked by accelerated growth | Synonyms: prepubertal |
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| prescient | (adjective) perceiving the significance of events before they occur | - |
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| present | (adjective) temporal sense; intermediate between past and future; now existing or happening or in consideration | - |
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| (adjective) being or existing in a specified place | - |
| prevalent | (adjective) most frequent or common | Synonyms: dominant, predominant, prevailing, rife |
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| prevenient | (adjective) in anticipation | Synonyms: anticipatory |
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| procumbent | (adjective) having stems that trail along the ground without putting down roots | - |
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| proficient | (adjective) of or relating to technique or proficiency in a practical skill | Synonyms: technical |
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| (adjective) having or showing knowledge and skill and aptitude | Synonyms: adept, expert, good, practiced, skilful, skillful |
| prominent | (adjective) having a quality that thrusts itself into attention | Synonyms: outstanding, salient, spectacular, striking |
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| (adjective) conspicuous in position or importance | Synonyms: big, large |
| propellant | (adjective) tending to or capable of propelling | Synonyms: propellent, propelling, propulsive |
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| propellent | (adjective) tending to or capable of propelling | Synonyms: propellant, propelling, propulsive |
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| prospicient | (adjective) planning prudently for the future | Synonyms: farseeing, farsighted, foresighted, foresightful, long, longsighted |
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| protestant | (adjective) protesting | - |
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| protuberant | (adjective) curving outward | Synonyms: bellied, bellying, bulbous, bulging, bulgy |
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| provident | (adjective) providing carefully for the future | - |
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| (adjective) careful in regard to your own interests | - |
| prudent | (adjective) careful and sensible; marked by sound judgment | - |
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| prurient | (adjective) characterized by lust | Synonyms: lubricious, lustful, salacious |
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| puberulent | (adjective) covered with fine soft hairs or down | Synonyms: downy, pubescent, sericeous |
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| pubescent | (adjective) covered with fine soft hairs or down | Synonyms: downy, puberulent, sericeous |
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| (adjective) (of animals especially human beings) having arrived at the onset of puberty (the age at which sex glands become functional) but not yet fully mature | - |
| puissant | (adjective) powerful or influential | - |
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| pungent | (adjective) capable of wounding | Synonyms: barbed, biting, mordacious, nipping |
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| (adjective) strong and sharp | Synonyms: acrid |
| pursuant | (adjective) (followed by `to') in conformance to or agreement with | - |
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| purulent | (adjective) containing pus | Synonyms: pussy |
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| putrefacient | (adjective) causing or promoting bacterial putrefaction | Synonyms: putrefactive |
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| putrescent | (adjective) becoming putrid | - |
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| quaint | (adjective) attractively old-fashioned (but not necessarily authentic) | Synonyms: old-time, olde worlde |
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| (adjective) strange in an interesting or pleasing way | - |
| (adjective) very strange or unusual; odd or even incongruous in character or appearance | - |
| quiescent | (adjective) being quiet or still or inactive | - |
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| (adjective) (pathology) causing no symptoms | - |
| (adjective) not active or activated | - |
| (adjective) marked by a state of tranquil repose | - |
| radiant | (adjective) radiating or as if radiating light | Synonyms: beaming, beamy, effulgent, refulgent |
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| radiolucent | (adjective) almost complete transparent to X-rays or other forms of radiation | - |
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| rampant | (adjective) (of a plant) having a lush and unchecked growth | - |
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| (adjective) rearing on left hind leg with forelegs elevated and head usually in profile | Synonyms: rearing |
| (adjective) unrestrained and violent | - |
| recalcitrant | (adjective) marked by stubborn resistance to authority | - |
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| (adjective) stubbornly resistant to authority or control | Synonyms: fractious, refractory |
| recent | (adjective) new | - |
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| (adjective) of the immediate past or just previous to the present time | Synonyms: late |
| recombinant | (adjective) of or relating to recombinant DNA | - |
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| recreant | (adjective) lacking even the rudiments of courage; abjectly fearful | Synonyms: craven |
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| (adjective) having deserted a cause or principle | Synonyms: renegade |
| recrudescent | (adjective) the revival of an unfortunate situation after a period of abatement | - |
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| recumbent | (adjective) lying down; in a position of comfort or rest | Synonyms: accumbent, decumbent |
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| recurrent | (adjective) recurring again and again | Synonyms: perennial, repeated |
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| recusant | (adjective) refusing to submit to authority | - |
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| (adjective) (of Catholics) refusing to attend services of the Church of England | Synonyms: dissentient |
| redolent | (adjective) having a strong pleasant odor | Synonyms: aromatic |
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| (adjective) serving to bring to mind | Synonyms: evocative, remindful, reminiscent, resonant |
| (adjective) (used with `of' or `with') noticeably odorous | Synonyms: smelling |
| redundant | (adjective) more than is needed, desired, or required | Synonyms: excess, extra, spare, supererogatory, superfluous, supernumerary, surplus |
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| (adjective) repetition of same and identical sense with different and non-identical words | Synonyms: pleonastic, tautologic, tautological |
| reentrant | (adjective) (of angles) pointing inward | Synonyms: re-entrant |
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| referent | (adjective) having reference | - |
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| refrigerant | (adjective) causing cooling or freezing | Synonyms: refrigerating |
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| refulgent | (adjective) radiating or as if radiating light | Synonyms: beaming, beamy, effulgent, radiant |
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| regardant | (adjective) looking backward | - |
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| regent | (adjective) acting or functioning as a regent or ruler | - |
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| regnant | (adjective) exercising power or authority | Synonyms: reigning, ruling |
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| relaxant | (adjective) tending to relax or relieve muscular or nervous tension | - |
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| relevant | (adjective) having a bearing on or connection with the subject at issue | - |
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| reliant | (adjective) relying on another for support | - |
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| reluctant | (adjective) disinclined to become involved | - |
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| (adjective) not eager | - |
| (adjective) unwillingness to do something contrary to your custom | Synonyms: loath, loth |
| reminiscent | (adjective) serving to bring to mind | Synonyms: evocative, redolent, remindful, resonant |
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| remittent | (adjective) (of a disease) characterized by periods of diminished severity | - |
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| renascent | (adjective) rising again as to new life and vigor | Synonyms: resurgent |
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| renunciant | (adjective) used especially of behavior | Synonyms: renunciative, self-abnegating, self-denying |
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| repellant | (adjective) highly offensive; arousing aversion or disgust | Synonyms: disgustful, disgusting, distasteful, foul, loathly, loathsome, repellent, repelling, revolting, skanky, wicked, yucky |
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| (adjective) serving or tending to repel | Synonyms: rebarbative, repellent |