| A | B |
|---|
| Indolent | Lazy |
| Indubitable | Certain; indisputable |
| Inebriated | Drunk |
| Ingénue | Naïve, young woman; actress playing such a role |
| Inveterate | Firmly established by age; habitual |
| Jetsam | Goods cast overboard from a ship to lighten it in distress |
| Lackey | Slavish; mindless follower |
| Laconic | Using words sparingly |
| Lagniappe | Something extra |
| Laudatory | Expressing praise |
| Lethal | Deadly |
| Levity | Lack of proper seriousness; frivolity; playfulness |
| Maladroit | Unskillful; clumsy |
| Malediction | A curse |
| Masticate | To chew |
| Matriculation | To enroll in a college or university |
| Maudlin | Weak and mushy; sentimental and tearful |
| Mélange | A mixture |
| Mercurial | Changeable; vivacious; lively |
| Missive | A letter |
| Monophobia | Fear of being alone |
| Morphology | The study of the form and structure of an organism |
