Synonyms of weak in English:

weak


See definition of weak

adjective

1‘they are too weak to move’

SYNONYMS
frail, feeble, puny, fragile, delicate, weakly
infirm, sick, sickly, shaky, debilitated, incapacitated, ailing, indisposed, decrepit, enervated, tired, fatigued, exhausted, spent, worn out
informal weedy
ANTONYMS

strong

2‘bats have very weak eyes’

SYNONYMS
inadequate, poor, feeble
defective, faulty, flawed, deficient, imperfect, substandard, lacking, wanting
ANTONYMS

strong, powerful, keen

3‘she made some weak excuse to break the appointment’

SYNONYMS
unconvincing, untenable, tenuous, implausible, unsatisfactory, slight, poor, inadequate, thin, transparent
unsound, feeble, flimsy, lame, hollow
informal pathetic
ANTONYMS

convincing

4‘I was too weak to be a rebel’

SYNONYMS
irresolute, spineless, craven, cowardly, pusillanimous, timorous, timid, indecisive, ineffectual, useless, inept, effete, meek, tame, powerless, ineffective, impotent, namby-pamby, soft, lily-livered, faint-hearted
informal yellow, weak-kneed, gutless, yellow-bellied, chicken-hearted, chicken
ANTONYMS

strong, resolute

5‘he had only a weak light to work by’

SYNONYMS
dim, pale, wan, faint, dull, feeble, muted
ANTONYMS

strong, bright

6‘‘you did this to her,’ he said in a weak voice’

SYNONYMS
indistinct, muffled, stifled, muted, hushed, faint, low, scarcely audible
ANTONYMS

strong, loud

7‘they drank weak coffee’

SYNONYMS
watery, diluted, dilute, watered down, thinned down, thin, adulterated, tasteless, flavourless, bland, insipid, mild
informal wishy-washy
ANTONYMS

strong, powerful

8‘a weak smile’

SYNONYMS
unenthusiastic, feeble, half-hearted, limp, lame

Phrases

    weak at the knees

    ‘she has accepted a challenge that would make the bravest man go weak at the knees’


    SYNONYMS

    faint, dizzy, light-headed, giddy, shaky

    weak-kneed, wobbly, quivery, unsteady, groggy, muzzy

    informal

    trembly, all of a tremble, all of a quiver, with rubbery legs, woozy

    rare

    vertiginous