ضعیف (صفت)
light, lean, anemic, weak, faint, weakly, feeble, flagging, anile, asthenic, slack, atonic, infirm, fragile, pusillanimous, sappy, puny, feeblish, languid, shaky, rickety, languorous, weakish, wonky, powerless
ناتوان (صفت)
weak, feeble, asthenic, unable, incapable, impotent, invalid, sickly, infirm
سست (صفت)
doddered, effeminate, flaggy, weak, feeble, torpid, asthenic, loose, frail, flimsy, slack, atonic, slow, insecure, sleazy, floppy, lax, idle, lazy, indolent, slothful, groggy, remiss, washy, wishy-washy, inactive, slumberous, slumbery, feckless, flabby, flaccid, languid, slumbrous, lethargic, shaky, rickety, rattletrap, wonky, supine, tottery