1. (adv.) In a weak manner; with little strength or vigor; feebly.

2. (superl.) Not strong of constitution; infirm; feeble; as, a weakly woman; a man of a weakly constitution.

a bit a la sourdine a little anemic asthenic barely bloodless by a hair by an ace cachectic chicken cowardly daintily debilitated decrepit delicately dimly drained drooping droopy dull effeminately effete enervated etiolated ever so little exhausted exiguously failing faint faintish faintly feeble feebly flabby flaccid flimsy floppy fragile frail gently gone gutless hardly healthless hushedly imbecile imperfectly impotent in poor health inappreciably inconsequentially infirm infirmly insignificantly insubstantial invalid just a bit languid languishing languorous languorously lightly limber limp listless listlessly little low lustless marrowless meagerly minimally minutely moribund negligibly nerveless not hardly only just pale peaked peaky pianissimo piano pithless pooped powerless reduced reduced in health rubbery run-down sapless scantily scarcely shakily sickly sinewless slack slightly soft softly sordamente sordo spineless strengthless strengthlessly subduedly tant soit peu teeteringly totteringly triflingly unhardened unhealthy unnerved unsound unsoundly unsteadily unstrung unsubstantial unsubstantially valetudinarian valetudinary weak weakened with low resistance