Antonyms of adj slow-witted

1 sense of slow-witted

Sense 1
backward, half-witted, slow-witted, feebleminded -- (retarded in intellectual development)

INDIRECT (VIA retarded) -> precocious -- (characterized by or characteristic of exceptionally early development or maturity (especially in mental aptitude); "a precocious child"; "a precocious achievement")

Similarity of adj slow-witted

1 sense of slow-witted

Sense 1
backward, half-witted, slow-witted, feebleminded -- (retarded in intellectual development)
       => retarded (vs. precocious) -- (relatively slow in mental or emotional or physical development; "providing a secure and sometimes happy life for the retarded")

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