Synonyms for weak

modified

1. Lacking physical strength; said of persons

   delicate, puny, flabby, flaccid, debilitated, effeminate, feeble, frail, sickly, infirm, decrepit, enervated, senile; see also sick.

   Antonyms strong*, healthy*, robust.

2. Lacking physical strength; said of things

   flimsy, makeshift, brittle, unsubstantial, jerry-built, rickety, tumbledown, sleazy, shaky, unsteady, ramshackle, rotten, wobbly, tottery, top-heavy.

   Antonyms strong*, shatter-proof, sturdy.

3. Lacking mental firmness or character

   weak-minded, nerveless, fainthearted, irresolute, nervous, spineless, unstrung, palsied, wishy-washy, caitiff, hesitant, vacillating, frightened.

   Antonyms brave*, courageous, adventurous.

4. Lacking in volume

   thin, low, soft, indistinct, feeble, faint, dim, muffled, whispered, bated, inaudible, light, stifled, dull, pale.

   Antonyms loud*, strong, forceful.

5. Lacking in military power

   small, paltry, ineffectual, ineffective, inadequate, impotent, ill-equipped, insufficiently armed, limited, unorganized, undisciplined, untrained, vulnerable, exposed, assailable, unprepared.

6. Lacking in capacity or experience

   unsure, raw, green, fresh, untrained, young, backward, insecure, immature, unsteady, handicapped, soft, shaky, uncertain, incomplete, untried.

   Antonyms experienced*, expert, trained*.

weak, the broadest in application of these words, basically implies a lack or inferiority of physical, mental, or moral strength a weak muscle, mind, character, foundation, excuse, etc.; feeble suggests a pitiable weakness or ineffectiveness a feeble old man, a feeble joke; frail suggests an inherent or constitutional delicacy or weakness, so as to be easily broken or shattered a frail body, conscience, etc.; infirm suggests a loss of strength or soundness, as through illness or age his infirm old grandfather; decrepit implies a being broken down, worn out, or decayed, as by old age or long use a decrepit old pensioner, a decrepit sofa