| Term | Definition |
| misogamy | n. hatred of marriage |
| mollycoddle | v. pamper; indulge excessively |
| mote | n. small speck |
| motility | n. ability to move spontaneously |
| mulct | v. defraud a person of something |
| multifarious | adj. varied; greatly diversified |
| munificent | adj. very generous |
| nadir | n. lowest point |
| natty | adj. neatly or smartly dressed |
| necromancy | n. black magic; dealings with the dead |
| nefarious | adj. very wicked |
| nettle | v. annoy, vex |
| niggle | v. spend too much time on minor points |
| noisome | adj. foul-smelling; fetid |
| nostrum | n. questionable medicine |
| nugatory | adj. futile; worthless |
| numismatist | n. person who collects coins |
| obdurate | adj. stubborn |
| obfuscate | v. confuse; muddle; cause confusion; make needlessly complex |
| obloquy | n. slander; disgrace; infamy |
| obsequy | n. funeral ceremony |
| obstreperous | adj. boisterous |
| obviate | v. make unnecessary; get rid of |
| occlude | v. shut; close |
| officious | adj. meddlesome excessively pushy in offering one's services |
| onerous | adj. burdensome |
| onus | n. burden; responsibility |
| oratorio | n. dramatic poem set to music |
| orthography | n. correct spelling |
| osseous | adj. made of bone; bony |
| overweening | adj. presumptuous; arrogant |
| overwrought | adj. extremely agitated; hysterical |
| paean | n. song of praise or of joy |
| pall | v. grow tiresome |
| pan | v. criticize harshly |
| pander | v. cater to the low desires of others |
| panegyric | n. formal praise |
| paramour | n. illicit lover |
| parlance | n. language; idiom |
| parley | n. conference |
| paroxysm | n. fit or attack of pain, laughter, rage |
| parry | v. ward off a blow; deflect |
| pathos | n. tender sorrow; pity; quality in art or literature that produces these feelings |
| patois | n. local or provincial dialect |
| pell-mell | adv. in confusion; disorderly |
| pellucid | adj. transparent; limpid, easy to understand |
| penumbra | n. partial shadow (in an eclipse) |
| penury | n. severe poverty; stinginess |
| perdition | n. damnation; complete ruin |
| perfidious | adj. treacherous; disloyal |
| peroration | n. conclusion of an oration |
| perquisite | n. any gain above stipulated salary |
| perspicacious | adj. having insight; penetrating; astute |
| perspicuous | adj. plainly expressed |
| perspicuity | n. clearness of expression, freedom from ambiguity |
| pert | adj. impertinent; forward |
| pertinacious | adj. stubborn; persistent |
| pharisaical | adj. pertaining to the Pharisees, paying scrupulous attention to tradition; self-righteous; hypocritical |
| philanderer | n. faithless lover flirt |