abulic, afraid, aged, ailing, anemic, anile, asthenic, backward, barely audible, blear, bleared, bleary, bloodless, blurred, blurry, cachectic, chicken, confused, cowardly, crabbed, dark, debilitated, decrepit, decrescendo, delicate, dim, dim-witted, distant, dizzy, doddered, doddering, doddery, drained, drooping, droopy, dull, effete, emasculated, enervated, enfeebled, etiolated, exhausted, failing, faint, faint-voiced, fainthearted, faintish, feckless, feebleminded, filmy, flabby, flaccid, flimsy, floppy, foggy, forceless, fossilized, fragile, frail, fuzzy, gentle, gerontal, gerontic, gone, gutless, half-baked, half-heard, half-seen, half-visible, half-witted, hazy, healthless, helpless, ill-defined, imbecile, imperceptible, impotent, impuissant, in poor health, inadequate, inconclusive, inconspicuous, indefinite, indistinct, indistinguishable, ineffective, ineffectual, infirm, insignificant, insubstantial, insufficient, invalid, invertebrate, lame, languid, languishing, languorous, limber, limp, listless, low, low-profile, lustless, marrowless, merely glimpsed, misty, moribund, moronic, mossbacked, moth-eaten, mummylike, murmured, namby-pamby, nerveless, obscure, out of focus, pale, palsied, paltry, papery-skinned, peaked, peaky, pianissimo, piano, pithless, pliable, pooped, poor, powerless, puny, ravaged with age, reduced, reduced in health, rickety, rubbery, run to seed, run-down, rusty, sapless, scarcely heard, semivisible, senile, shadowy, shaky, shoddy, shriveled, sickly, simpleminded, sinewless, slack, slight, slow, slow-witted, soft, soft-sounding, soft-voiced, spineless, spiritless, strengthless, stricken in years, subaudible, subdued, thin, timeworn, tottering, tottery, unavailing, uncertain, unclear, unconvincing, undefined, unhardened, unhealthy, unmanned, unnerved, unplain, unproved, unrecognizable, unrigorous, unsatisfactory, unsound, unstrung, unsubstantial, unsustained, vague, valetudinarian, valetudinary, weak, weak-kneed, weak-minded, weak-voiced, weak-willed, weakened, weakly, wet, whispered, wishy-washy, with low resistance, withered, wizened, woozy