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smart as a tack

ADJECTIVE

sharp

Synonyms

STRONGEST

acute bright brilliant fast intelligent nimble quick slick smart subtle

STRONG

alert keen knowing original ready savvy sensitive wise

WEAK

adroit apt astute brainy canny clever critical cute discerning discriminating foxy having smarts ingenious nobody's fool not born yesterday observant on the ball penetrating penetrative quick on the trigger quick on the uptake resourceful

Antonyms

STRONGEST

dull normal slow stupid unaware unintelligent

STRONG

ignorant