Synonyms and related words :
anemic, asthenic, bloodless, chicken, cowardly, debilitated, drooping, droopy, dull, effete, emasculated, etiolated, faint, faintish, feeble, flabby, flimsy, floppy, gone, gutless, imbecile, impotent, languid, languorous, lax, limber, limp, listless, loose, lustless, marrowless, nerveless, pithless, pooped, powerless, relaxed, rubbery, sapless, sapped, sinewless, slack, sleazy, soft, spineless, strengthless, unhardened, unnerved, unstrung, weak, weakened, weakly