| inactive(lethargic, languid, indolent) |
| inattentive(lethargic, languid, indolent) |
| indifferent(lethargic, languid, indolent) |
| indolent(lethargic, languid) |
| inert(lethargic, languid, indolent) |
| jaw |
| lackadaisical(lethargic, languid, indolent) |
| lagging(adjective, dull, stupid, sluggish, lifeless) |
| laid-back(lethargic, languid, indolent) |
| laid back(expression, adjective, stupid, listless) |
| languid(lethargic, indolent) |
| languishing(adjective, dull, sluggish, lethargic, limp) |
| languorous(lethargic, languid, indolent) |
| leaden(adjective, dull, sluggish, lethargic, limp) |
| let-down(hyper, cast-down, fe) |
| lethargic(languid, indolent) |
| lifeless(lethargic, languid, sleepy, indolent, lukewarm) |
| limp(adjective, dull, sluggish, lethargic, languid) |
| low-down(hyper, cast-down, fe) |
| low down(expression, hyper, cast-down, fe) |