| Term | Definition |
| macabre | grim and horrible , gruesome , ghastly |
| maelstrom | a situation full of strong emotions or confusing events |
| malapropism | ludicrous misuse of words |
| malediction | curse |
| martinet | very strict disciplinarian |
| masochist | person who enjoys his own pain |
| masticate | to chew |
| maudlin | tearfully sentimental |
| maunder | wander , ramble |
| mausoleum | tomb , sepulture |
| maverick | nonconformist |
| mayhem | injury inflicted |
| melange | mixture |
| mendacious | not truthful , lying |
| mendicant | beggar |
| meretricious | attractive in a flashy way , tawdry |
| misanthrope | person who hates all people |
| modicum | small amount , bit |
| mordant | biting , cutting , caustic , sarcastic |
| moribund | coming to an end , dying |
| mortify | to feel shame , humiliation , chagrin |