| perfidious | (adjective) tending to betray; especially having a treacherous character as attributed to the Carthaginians by the Romans | Synonyms: punic, treacherous |
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| perilous | (adjective) fraught with danger | Synonyms: parlous, precarious, touch-and-go |
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| peritrichous | (adjective) covered all over with uniformly distributed flagella | - |
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| pernicious | (adjective) working or spreading in a hidden and usually injurious way | Synonyms: insidious, subtle |
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| (adjective) exceedingly harmful | Synonyms: baneful, deadly, pestilent |
| perspicacious | (adjective) mentally acute or penetratingly discerning | Synonyms: clear-eyed, clear-sighted |
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| (adjective) acutely insightful and wise | Synonyms: sagacious, sapient |
| perspicuous | (adjective) (of language) transparently clear; easily understandable | Synonyms: crystal clear, limpid, lucid, luculent, pellucid |
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| pertinacious | (adjective) stubbornly unyielding | Synonyms: dogged, dour, persistent, tenacious, unyielding |
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| pervious | (adjective) admitting of passage or entrance | - |
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| pestiferous | (adjective) causing irritation or annoyance | Synonyms: annoying, bothersome, galling, irritating, nettlesome, pesky, pestering, plaguey, plaguy, teasing, vexatious, vexing |
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| (adjective) likely to spread and cause an epidemic disease | Synonyms: pestilent, pestilential, plaguey |
| (adjective) tending to corrupt or pervert | Synonyms: corruptive, perversive |
| (adjective) contaminated with infecting organisms | Synonyms: dirty |
| petalless | (adjective) (of flowers) having no petals | Synonyms: apetalous |
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| petalous | (adjective) (of flowers) having petals | Synonyms: petaled, petalled |
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| petrous | (adjective) (of bone especially the temporal bone) resembling stone in hardness | Synonyms: stonelike |
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| phosphorous | (adjective) containing or characteristic of phosphorus | Synonyms: phosphoric |
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| phytophagous | (adjective) (of animals) feeding on plants | Synonyms: phytophagic, phytophilous, plant-eating |
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| phytophilous | (adjective) (of animals) feeding on plants | Synonyms: phytophagic, phytophagous, plant-eating |
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| pilosebaceous | (adjective) of or relating to a hair follicle and its sebaceous gland | - |
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| pilotless | (adjective) lacking a pilot | - |
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| pilous | (adjective) covered with hairs especially fine soft ones | Synonyms: pilary, pilose |
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| pious | (adjective) having or showing or expressing reverence for a deity | - |
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| piscivorous | (adjective) feeding on fishes | - |
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| piteous | (adjective) deserving or inciting pity | Synonyms: hapless, miserable, misfortunate, pathetic, pitiable, pitiful, poor, wretched |
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| pitiless | (adjective) deficient in humane and kindly feelings | Synonyms: unkind |
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| (adjective) without mercy or pity | Synonyms: remorseless, ruthless, unpitying |
| planless | (adjective) aimlessly drifting | Synonyms: adrift, afloat, aimless, directionless, rudderless, undirected |
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| platitudinous | (adjective) dull and tiresome but with pretensions of significance or originality | Synonyms: bromidic, corny, platitudinal |
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| plenteous | (adjective) affording an abundant supply | Synonyms: ample, copious, plentiful, rich |
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| pleurocarpous | (adjective) (of mosses) having the archegonia on short lateral branches | - |
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| plumbaginaceous | (adjective) of or pertaining to or characteristic of plants of the family Plumbaginaceae | - |
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| plumbous | (adjective) relating to or consisting of lead | Synonyms: plumbic |
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| plus | (adjective) on the positive side or higher end of a scale | - |
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| (adjective) involving advantage or good | Synonyms: positive |
| poikilothermous | (adjective) of animals except birds and mammals; having body temperature that varies with the environment | Synonyms: ectothermic, heterothermic, poikilothermic |
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| pointless | (adjective) not having a point especially a sharp point | Synonyms: unpointed |
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| (adjective) having no points scores | Synonyms: goalless, hitless, scoreless |
| (adjective) serving no useful purpose; having no excuse for being | Synonyms: otiose, purposeless, senseless, superfluous, wasted |
| poisonous | (adjective) not safe to eat | - |
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| (adjective) marked by deep ill will; deliberately harmful | Synonyms: venomous, vicious |
| (adjective) having the qualities or effects of a poison | Synonyms: toxicant |
| polemoniaceous | (adjective) of or pertaining to or characteristic of plants of the family Polemoniaceae | - |
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| polyandrous | (adjective) having more than one husband at a time | - |
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| polydactylous | (adjective) of or relating to a person (or other vertebrate) having more than the normal number of digits | Synonyms: polydactyl |
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| polyestrous | (adjective) having more than one period of estrus per year | Synonyms: polyoestrous |
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| polygamous | (adjective) having more than one mate at a time; used of relationships and individuals | - |
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| (adjective) having several forms of gametoecia on the same plant | Synonyms: heteroicous, polyoicous |
| polygynous | (adjective) having more than one wife at a time | - |
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| polymorphous | (adjective) relating to the occurrence of more than one kind of individual (independent of sexual differences) in an interbreeding population | Synonyms: polymorphic |
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| (adjective) relating to the crystallization of a compound in two or more different forms | Synonyms: polymorphic |
| (adjective) having or occurring in several distinct forms | Synonyms: polymorphic |
| polyoestrous | (adjective) having more than one period of estrus per year | Synonyms: polyestrous |
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| polyoicous | (adjective) having several forms of gametoecia on the same plant | Synonyms: heteroicous, polygamous |
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| polypetalous | (adjective) having a corolla composed of many separated or distinct petals | - |
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| polyphonous | (adjective) of or relating to or characterized by polyphony | Synonyms: polyphonic |
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| polysemous | (adjective) of words; having many meanings | Synonyms: polysemantic |
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| pompous | (adjective) characterized by pomp and ceremony and stately display | Synonyms: ceremonious |
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| (adjective) puffed up with vanity | Synonyms: grandiloquent, overblown, pontifical, portentous |
| ponderous | (adjective) slow and laborious because of weight | Synonyms: heavy, lumbering |
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| (adjective) having great mass and weight and unwieldiness | - |
| (adjective) labored and dull | - |
| populous | (adjective) densely populated | Synonyms: thickly settled |
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| poriferous | (adjective) full of pores or vessels or holes | Synonyms: porous |
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| porous | (adjective) full of pores or vessels or holes | Synonyms: poriferous |
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| (adjective) allowing passage in and out | Synonyms: holey |
| (adjective) able to absorb fluids | - |
| portentous | (adjective) puffed up with vanity | Synonyms: grandiloquent, overblown, pompous, pontifical |
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| (adjective) ominously prophetic | Synonyms: fateful, foreboding |
| (adjective) of momentous or ominous significance | Synonyms: prodigious |
| posthumous | (adjective) occurring or coming into existence after a person's death | - |
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| powerless | (adjective) lacking power | - |
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| precancerous | (adjective) of or relating to a growth that is not malignant but is likely to become so if not treated | - |
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| precarious | (adjective) fraught with danger | Synonyms: parlous, perilous, touch-and-go |
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| (adjective) not secure; beset with difficulties | Synonyms: shaky |
| (adjective) affording no ease or reassurance | Synonyms: unstable |
| precious | (adjective) obviously contrived to charm | Synonyms: cute |
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| (adjective) characterized by feeling or showing fond affection for | Synonyms: cherished, treasured, wanted |
| (adjective) of high worth or cost | - |
| (adjective) held in great esteem for admirable qualities especially of an intrinsic nature | Synonyms: valued |
| precipitous | (adjective) done with very great haste and without due deliberation | Synonyms: hasty, overhasty, precipitant, precipitate |
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| (adjective) dangerously steep | Synonyms: abrupt, sharp |
| precocious | (adjective) characterized by or characteristic of exceptionally early development or maturity (especially in mental aptitude) | - |
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| (adjective) appearing or developing early | - |
| predaceous | (adjective) living by or given to victimizing others for personal gain | Synonyms: predacious, predatory |
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| (adjective) hunting and killing other animals for food | Synonyms: predacious |
| predacious | (adjective) living by or given to victimizing others for personal gain | Synonyms: predaceous, predatory |
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| (adjective) hunting and killing other animals for food | Synonyms: predaceous |
| prejudicious | (adjective) tending to favor preconceived ideas | Synonyms: prejudicial |
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| (adjective) (sometimes followed by `to') causing harm or injury | Synonyms: damaging, detrimental, prejudicial |
| preposterous | (adjective) so unreasonable as to invite derision | Synonyms: absurd, cockeyed, derisory, idiotic, laughable, ludicrous, nonsensical, ridiculous |
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| prestigious | (adjective) exerting influence by reason of high status or prestige | - |
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| (adjective) having an illustrious reputation; respected | Synonyms: esteemed, honored, honoured |
| presumptuous | (adjective) excessively forward | Synonyms: assuming, assumptive |
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| pretentious | (adjective) making claim to or creating an appearance of (often undeserved) importance or distinction | - |
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| (adjective) intended to attract notice and impress others | Synonyms: ostentatious |
| (adjective) (of a display) tawdry or vulgar | Synonyms: ostentatious |
| previous | (adjective) too soon or too hasty | Synonyms: premature |
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| (adjective) (used especially of persons) of the immediate past | Synonyms: former, late |
| (adjective) just preceding something else in time or order | Synonyms: old |
| priceless | (adjective) having incalculable monetary, intellectual, or spiritual worth | Synonyms: invaluable |
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| primiparous | (adjective) of or relating to a woman who has given birth only once | - |
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| prodigious | (adjective) far beyond what is usual in magnitude or degree | Synonyms: exceeding, exceptional, olympian, surpassing |
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| (adjective) so great in size or force or extent as to elicit awe | Synonyms: colossal, stupendous |
| (adjective) of momentous or ominous significance | Synonyms: portentous |
| profitless | (adjective) without profit or reward | - |
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| prognathous | (adjective) having a projecting lower jaw | Synonyms: hypognathous, prognathic |
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| promiscuous | (adjective) not selective of a single class or person | - |
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| (adjective) casual and unrestrained in sexual behavior | Synonyms: easy, light, loose, sluttish, wanton |
| propertyless | (adjective) of those who work for wages especially manual or industrial laborers | Synonyms: blue-collar, wage-earning, working-class |
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| propitious | (adjective) presenting favorable circumstances; likely to result in or show signs of success | - |
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| prosperous | (adjective) marked by peace and prosperity | Synonyms: golden, halcyon |
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| (adjective) presaging or likely to bring good luck or a good outcome | Synonyms: favorable, favourable, golden, lucky |
| (adjective) in fortunate circumstances financially; moderately rich | Synonyms: comfortable, easy, well-fixed, well-heeled, well-off, well-situated, well-to-do |
| (adjective) very lively and profitable | Synonyms: booming, burgeoning, flourishing, palmy, prospering, roaring, thriving |
| proteinaceous | (adjective) relating to or of the nature of protein | - |
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| pseudonymous | (adjective) bearing or identified by an assumed (often pen) name | - |
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| pugnacious | (adjective) ready and able to resort to force or violence | Synonyms: rough |
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| (adjective) tough and callous by virtue of experience | Synonyms: hard-bitten, hard-boiled |
| pulchritudinous | (adjective) used of persons only; having great physical beauty | - |
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| pulseless | (adjective) appearing dead; not breathing or having no perceptible pulse | Synonyms: breathless, inanimate |
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| punctilious | (adjective) marked by precise accordance with details | Synonyms: meticulous |
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| punctureless | (adjective) being without punctures or incapable of being punctured | - |
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| purposeless | (adjective) not evidencing any purpose or goal | - |
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| (adjective) serving no useful purpose; having no excuse for being | Synonyms: otiose, pointless, senseless, superfluous, wasted |
| pusillanimous | (adjective) lacking in courage and manly strength and resolution; contemptibly fearful | Synonyms: poor-spirited, unmanly |
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| pyrogenous | (adjective) produced under conditions involving intense heat | Synonyms: igneous, pyrogenic |
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| (adjective) produced by or producing fever | Synonyms: pyrogenetic, pyrogenic |
| pyroligneous | (adjective) of a substance produced by the effect of heat on wood, especially by destructive distillation | Synonyms: pyrolignic |
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| quenchless | (adjective) impossible to quench | Synonyms: unquenchable |
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| querulous | (adjective) habitually complaining | Synonyms: fretful, whiney, whiny |
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| quits | (adjective) on equal terms by payment or requital | - |
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| raimentless | (adjective) possessing no clothing | Synonyms: clothesless, garmentless |
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| rainless | (adjective) lacking rain | - |
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| rambunctious | (adjective) noisy and lacking in restraint or discipline | Synonyms: boisterous, robustious, rumbustious, unruly |
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| ramous | (adjective) having branches | Synonyms: branched, branching, ramate, ramose |
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| rampageous | (adjective) displaying raging violence; often destructive | - |
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| rancorous | (adjective) showing deep-seated resentment | - |
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| rapacious | (adjective) excessively greedy and grasping | Synonyms: ravening, voracious |
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| (adjective) living by preying on other animals especially by catching living prey | Synonyms: predatory, raptorial, ravening, vulturine, vulturous |
| (adjective) devouring or craving food in great quantities | Synonyms: edacious, esurient, ravening, ravenous, voracious, wolfish |
| rapturous | (adjective) feeling great rapture or delight | Synonyms: ecstatic, enraptured, rapt, rhapsodic |
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| raucous | (adjective) unpleasantly loud and harsh | Synonyms: strident |
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| (adjective) disturbing the public peace; loud and rough | Synonyms: rowdy |
| ravenous | (adjective) devouring or craving food in great quantities | Synonyms: edacious, esurient, rapacious, ravening, voracious, wolfish |
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| (adjective) extremely hungry | Synonyms: esurient, famished, sharp-set, starved |
| rayless | (adjective) having no parts resembling rays; not having ray flowers | - |
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| reasonless | (adjective) not endowed with the capacity to reason | - |
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| (adjective) having no justifying cause or reason | Synonyms: causeless |
| (adjective) not marked by the use of reason | Synonyms: mindless, senseless |