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Definition of feeble : 1. Deficient in physical strength; weak; infirm; debilitated.
2. To make feble; to enfeeble.
3. Wanting force, vigor, or efficiency in action or expression; not full, loud, bright, strong, rapid, etc.; faint; as, a feeble color; feeble motion.

Synonyms:

light, ill-defined, coolheaded, rachitic, shadowy, indistinct, halt, swooning, weakly, wispy, light-headed, shaky, dim, crippled, insufficient, insubstantial, strong, halting, timid, wobbly, irresolute, wonky, fallible, sapless, unaccented, unsubstantial, languid, worn down, half-hearted, game, faint-hearted, lame, wearied, tenuous, debile, puny, flea-bitten, derelict, creaky, worn, faltering, nerveless, unsound, delicate, lightheaded, purposeless, ineffectual, gimpy, fainthearted, faded, cool, washy, vague, imperfect, ineffective, watery, woebegone

doddering, debilitated, frail, flimsy, powerless, infirm, soft, rickety, decrepit, faint, run-down, weak, ailing, fragile, sickly

anemic, impotent

fatigued, toilsome, over-weary, footsore, apathetic, sleepy, limp, flaccid, droopy, depressed, wayworn, uphill, tired, worn-out, bored, drowsy, frazzled, exhausted, trying, weary, wasted, cheerless, blue, listless

inadequate, disabled, incompetent, incapable

Usage examples:

• Pennyloaf had now but one child to look after, a girl of two years, a feeble thing. - "The Nether World", George Gissing.
• Moreover, they were uncertain, and, as I thought, feeble. - "The Coming of the King", James Hocking.
• As she took it with feeble hand, she asked:- " Lil', can you pray?" - "Children of the Tenements", Jacob A. Riis.