Serving no useful purpose; having no excuse for being:
— Advice is wasted words.

synonyms: otiose, pointless, purposeless, senseless, superfluous.

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

Roget 638: wasted etc. v.; at a low ebb.    wasteful etc. (prodigal) 818; penny wise and pound foolish.   

Roget 659: unimproved etc. (improve) etc. 658; deteriorated etc. v.; altered, altered for the worse; injured etc. v.; sprung; withering, spoiling etc. v.; on the wane, on the decline; tabid^†; degenerate; marescent^†; worse; the worse for, all the worse for; out of repair, out of tune; imperfect etc. 651; the worse for wear; battered; weathered, weather-beaten; stale, passe, shaken, dilapidated, frayed, faded, wilted, shabby, secondhand, threadbare; worn, worn to a thread, worn to a shadow, worn to the stump, worn to rags; reduced, reduced to a skeleton; far gone; tacky [U.S.].    decayed etc. v.; moth-eaten, worm-eaten; mildewed, rusty, moldy, spotted, seedy, time-worn, moss-grown; discolored; effete, wasted, crumbling, moldering, rotten, cankered, blighted, tainted; depraved etc. (vicious) 945; decrepid^†, decrepit; broke, busted, broken, out of commission, hors de combat [Fr.], out of action, broken down; done, done for, done up; worn out, used up, finished; beyond saving, fit for the dust hole, fit for the wastepaper basket, past work etc. (useless) 645.    at a low ebb, in a bad way, on one's last legs; undermined, deciduous; nodding to its fall etc. (destruction) 162; tottering etc. (dangerous) 665; past cure etc. (hopeless) 859; fatigued etc. 688; retrograde etc. (retrogressive) 283; deleterious etc. 649.    ... show more

Not used to good advantage:
— A wasted effort.

synonym: squandered.

of an organ or body part Diminished in size or strength as a result of disease or injury or lack of use.

synonyms: atrophied, diminished.

Dutch: afgestorven

Very thin especially from disease or hunger or cold:
— Kept life in his wasted frame only by grim concentration.

synonyms: cadaverous, emaciated, gaunt, haggard, pinched, skeletal.