Synonyms and related words :
ailing, ausgespielt, bad, below par, couchant, critically ill, crouched, debased, depressed, done, done up, down, effete, emptied, exhausted, faint, faintish, far-gone, fatigued, feeling awful, feeling faint, feeling something terrible, flat, frazzled, ill, in danger, indisposed, jaded, knee-high, knocked flat, low, low-built, low-hung, low-level, low-leveled, low-lying, low-set, low-statured, mortally ill, neap, not quite right, off-color, out of sorts, played out, pooped, prone, recumbent, rocky, run-down, runty, seedy, short, shotten, sick, sick unto death, sickish, spent, squat, squatty, stooped, stumpy, supine, taken ill, tired, under the weather, unelevated, unwell, used up, worn-out