| indolent(adjective, relaxed, weary, tired, sluggish) |
| inert(adjective, dull, weak, easy, slow) |
| infaust(adjective, sad, unhappy, unpleasant, woe) |
| infirm(adjective, dull, weak, easy, slow) |
| insignificancy |
| invertebrate |
| jellyfish |
| lackadaisical(adjective, dull, weak, easy, slow) |
| laggard(adjective, dull, stupid, idle, weary) |
| laid-back(adjective, dull, weak, easy, slow) |
| languishing(adjective, dull, weak, easy, slow) |
| languorous(adjective, dull, weak, easy, slow) |
| lazy(adjective, dull, weak, easy, slow) |
| leaden(adjective, dull, weak, easy, slow) |
| leisurely(adjective, dull, weak, easy, slow) |
| like a shag on a rock(adjective, sad, unhappy, unpleasant, woe) |
| limp(adjective, dull, weak, soft, easy) |
| listless(adjective, dull, weak, easy, slow) |
| little fellow |
| little guy |