| hefty(adjective, dull, boring, tired, tedious) |
| ho hum(expression, bad, disagreeable, tedious, workaday) |
| hollow |
| inexcitable |
| irritating(adjective, dull, boring, tired, tedious) |
| jading(adjective, dull, boring, tired, tedious) |
| laborious(adjective, dull, boring, tired, tedious) |
| lackluster(adjective, dull, simple, clean, plain) |
| laid back(expression, adjective, boring, lifeless, puny) |
| lenient(adjective, calm, weak, smooth, soft) |
| lenitive(adjective, calm, weak, smooth, soft) |
| light(adjective, calm, weak, smooth, pleasant) |
| literal(adjective, simple, flat, clean, plain) |
| long-winded |
| low-spirited |
| lowly(adjective, simple, clean, plain, ordinary) |
| lukewarm(adjective, calm, weak, smooth, soft) |
| lusterless(adjective, dull, bad, simple, flat) |
| matte(adjective, dull, flat, boring, lifeless) |
| matter-of- fact(expression, adjective, simple, clean, plain) |