| laid up(expression, sick, unwell, injured, debilitated) |
| languorous(adjective, dull, weak, easy, slow) |
| lax |
| malnourished(thin, pale, sickly-looking) |
| morbid |
| nauseous(adjective, diseased) |
| on the decline(expression, adjective, idiom) |
| out of sorts(expression, adjective, idiom, ill, sick) |
| pallid(adjective, weak, thin, ill, feeble) |
| pinched(adjective, thin, pale, sickly-looking) |
| prostrate(adjective, weak, uncertain, inadequate, feeble) |
| run down(expression, mean, weak, sick, green) |
| sapped(weakened, incapacitated) |
| scrawny(adjective, weak, uncertain, feeble, frail) |
| shilly-shally(adjective, irresolute, irresolution) |
| shrinking(adjective, irresolute) |
| skinny(adjective, thin, pale, sickly-looking) |
| slender(light, weak, slight, imaginary, flimsy) |
| small(adjective, weak, insignificant, feeble, trivial) |
| superannuated(adjective, feeble, tired, gray, mature) |