Lacking energy or vitality.

synonyms: adynamic, debilitated, enervated.

Roget 160: weak, feeble, debile^†; impotent etc. 158; relaxed, unnerved, etc. v.; sapless, strengthless^†, powerless; weakly, unstrung, flaccid, adynamic^†, asthenic^†; nervous.    soft, effeminate, feminate^†, womanly.    frail, fragile, shattery^†; flimsy, unsubstantial, insubstantial, gimcrack, gingerbread; rickety, creaky, creaking, cranky; craichy^†; drooping, tottering etc. v.. broken, lame, withered, shattered, shaken, crazy, shaky; palsied etc. 158; decrepit.    languid, poor, infirm; faint, faintish^†; sickly etc. (disease) 655; dull, slack, evanid^†, spent, short-winded, effete; weather-beaten; decayed, rotten, worn, seedy, languishing, wasted, washy, laid low, pulled down, the worse for wear.    unstrengthened etc. 159^†, unsupported, unaided, unassisted; aidless^†, defenseless etc. 158; cantilevered (support) 215.    on its last legs; weak as a child, weak as a baby, weak as a chicken, weak as a cat, weak as a rat; weak as water, weak as water gruel, weak as gingerbread, weak as milk and water; colorless etc. 429.    ... show more

Having a slender physique.