| Term | Definition |
| propitious | favorable; fortunate; advantageous |
| proponent | supporter; backer; opposite of opponent |
| propound | put forth for analysis |
| propriety | fitness; correct conduct |
| propulsive | driving forward |
| prosaic | dull and unimaginative; matter-of-fact; factual |
| proscribe | ostracize; banish; outlaw |
| proselytize | convert to a religion or belief |
| prostrate | stretch out full on ground |
| protean | versatile; able to take on many shapes |
| protocol | diplomatic etiquette |
| protract | prolong |
| protuberance | protrusion; bulge |
| provident | displaying foresight; thrifty; preparing for emergencies |
| provincial | pertaining to a province; limited in outlook; unsophisticated |
| provisional | tentative |
| provocative | arousing anger or interest; annoying |
| prowess | extraordinary ability; military bravery |
| proxy | authorized agent |
| prude | excessively modest person |
| prune | cut away; trim |
| prurient | having or causing lustful thoughts and desires |
| pterodactyl | extinct flying reptile |
| puerile | childish; immature |
| pugilist | boxer |
| pugnacity | combativeness; disposition to fight |
| pulchritude | beauty; comeliness |
| pummel | beat or pound with fists |
| punctilious | laying stress on niceties of conduct or form; minutely attentive to fine points (perhaps too much so) |
| pungent | stinging; sharp in taste or smell; caustic |
| puny | insignificant; tiny; weak |
| purchase | firm grasp or footing |
| purge | remove or get rid of something unwanted; free from blame or guilt; cleanse or purify |
| purported | alleged; claimed; reputed or rumored |
| purse | pucker; contract into wrinkles |
| purveyor | furnisher of foodstuffs; caterer |
| pusillanimous | cowardly; fainthearted |
| putrid | foul; rotten; decayed |
| pyromaniac | person with an insane desire to set things on fire |
| quack | charlatan; impostor |
| quadruped | four-footed animal |
| quaff | drink with relish |
| quagmire | soft, wet, boggy land; complex or dangerous situation from which it is difficult to free oneself |
| quail | cower; lose heart |
| quaint | odd; old-fashined; picturesque |
| qualified | limited; restricted |
| qualms | misgivings; uneasy fears; especially about matters of conscience |
| quandary | dilemma |
| quarantine | isolation of person or ship to prevent spread of infection |
| quarry | victim; object of a hunt |
| quarry | dig into |