| Laborious | Arduous, Burdensome, Onerous, Strenuous, Grueling |
| Lackadaisical | Lethargic, Languorous, Languid, Listless, Lazy, Indolent |
| Laudable | Praiseworthy, Creditable, Admirable, Outstanding |
| Lean | Slim, Thin |
| Legendary | Fabled, Storied, Traditional, Heroic, Epic, Mythic |
| Lethargic | Sluggish, Slow, Dull, Lazy |
| Lucid | Clear, Understandable |
| Ludicrous | Ridiculous, Laughable, Absurd, Farcical |
| Luscious | Delectable, Delicious |
| Luxurious | Opulent, Extravagant, Lavish, Magnificent |
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