| Term | Definition |
| misogamy | N. hatred of marriage |
| misogynist | N. hater of women |
| missive | N. letter |
| mite | N. very small object or creature; small coin |
| mitigate | V. lessen in intensity; moderate; appease |
| mnemonic | ADJ. pertaining to memory |
| mode | N. prevailing style; manner; way of doing something |
| modicum | N. limited quantity |
| modish | ADJ. fashionable |
| modulate | V. tone down in intensity; regulate; change from one key to another |
| mogul | N. powerful person |
| mollify | V. soothe |
| mollycoddle | V. pamper; indulge excessively |
| molt | V. shed or cast off hair or feathers |
| momentous | ADJ. very important |
| monarchy | N. government under a single ruler |
| monastic | ADJ. related to monks or monasteries; removed from worldly concerns |
| monochromatic | ADJ. having only one color |
| monolithic | ADJ. solidly uniform; unyielding |
| monotheism | N. belief in one God |
| monotony | N. sameness leading to boredom |
| monumental | ADJ. massive |
| moratorium | N. legal delay of payment |
| morbid | ADJ. given to unwholesome thought; moody; characteristic of disease |
| mordant | ADJ. biting; sarcastic; stinging |
| mores | N. conventions; moral standards; customs |
| moribund | ADJ. dying |
| morose | *ADJ. ill-humored; sullen; melancholy |
| mortician | N. undertaker |
| mortify | V. humiliate; punish the flesh |
| mosaic | N. picture made of small, colorful inlaid tiles |
| mote | N. small speck |
| motif | N. theme |
| motility | N. ability to move spontaneously |
| motley | ADJ. multicolored; mixed |
| mottled | ADJ. blotched in coloring; spotted |
| mountebank | N. charlatan; boastful pretender |
| muggy | ADJ. warm and damp |
| mulct | V. defraud a person of something |
| multifarious | ADJ. varied; greatly diversified |
| multiform | ADJ. having many forms |
| multiplicity | N. state of being numerous |
| mundane | *ADJ. worldly as opposed to spiritual; everyday |
| munificent | ADJ. very generous |
| mural | N. wall painting |
| murky | ADJ. dark and gloomy; thick with fog; vague |
| muse | V. ponder |
| musky | ADJ. having the odor of musk |
| muster | V. gather; assemble |
| musty | ADJ. stale; spoiled by age |
| mutability | N. ability to change form; fickleness |
| muted | ADJ. silent; muffled; toned down |
| mutilate | V. maim |
| mutinous | ADJ. unruly; rebellious |
| myopic | ADJ. nearsighted; lacking foresight |
| myriad | N. very large number |
| nadir | N. lowest point |
| naivete | N. quality of being unsophisticated; simplicity; artlessness; gullibility |
| narcissist | N. conceited person |
| nascent | ADJ. incipient; coming into being |