weak

adjective /wiːk/

Lacking the power to perform or resist.

Quick answer

Common synonyms for "weak" include feeble, frail, fragile, infirm. Choose by context — see groups below.

Synonyms for "weak"

weak — lacking physical strength

feeblefrailfragileinfirm

weak — lacking force or persuasiveness

flimsyunconvincingthintenuousshaky

weak — inadequate or substandard

inadequatedeficientlackingsubpar

Antonyms for "weak"

strongrobustpowerfulcompelling

Examples in context

  • It was a weak argument and it didn't hold up.
  • Her serve was weak after the injury.
  • The signal here is weak.
Usage note

Pick the kind of weakness: flimsy (argument), feeble (body), tenuous (logic), thin (excuse).