Achilles heel

Related

Adjectives:

adynamic, aidless, amyous, armless, asthenic, bald, broken, careless, childish, cold, cranky, crazy, creachy, crippled, dead beat, debile, decayed, decrepit, defenseless, demoralized, diffuse, disabled, disjointed, disqualified, docile, done up, drooping, dry, dull, effeminate, effete, elumbated, emasculate, evanid, exhausted, faint, faintish, fatherless, feeble, feminate, flaccid, flatulent, flimsy, forcible, frail, frigid, gimcrack, gingerbread, good for nothing, graveled, harmless, helpless, hypophrenic, hyposthenic, imbecile, impotent, improcreant, inadequate, inapt, incapable, incompetent, indefensible, ineffective, ineffectual, inefficacious, inefficient, inept, inexact, infirm, inoperative, irrelevant, jejune, laid low, laid on one's back, laid on the shelf, lame, languid, languishing, lax, loose, lustless, marrowless, meable, meager, monotonous, nerveless, nervous, nugatory, null and void, on its last legs, palsied, paralytic, paralyzed, parvipotent, pithless, poor, powerless, pregnable, prosaic, prosing, prosy, puerile, pulled down, queachy, radiolucent, rambling, relaxed, rickety, rotten, rudderless, sapless, seedy, shaken, shaky, shattered, shattery, short, sinewless, sketchy, slack, slight, slip, soft, spent, strengthless, tame, the worse for wear, tottering, trashy, unable, unaided, unapt, unarmed, unassisted, unconducing, unconducive, unconducting to, unendowed, unfit, unfitted, unfortified, unfriended, unhinged, uninfluential, unnerved, unqualified, unstrengthened, unstrung, unsubstantial, unsupported, untenable, unvaried, vapid, vincible, washy, wasted, waterlogged, weak, weak as a baby, weak as a cat, weak as a chicken, weak as a child, weak as a rat, weak as gingerbread, weak as milk and water, weak as water, weak as water, weaponless, weather, withered, without a leg to stand upon, womanly, wommacky, worn