Antonyms of adj dim-witted

1 sense of dim-witted

Sense 1
dim-witted, simple, simple-minded -- (lacking mental capacity and subtlety)

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 dim-witted

1 sense of dim-witted

Sense 1
dim-witted, simple, simple-minded -- (lacking mental capacity and subtlety)
       => retarded (vs. precocious) -- (relatively slow in mental or emotional or physical development; "providing a secure and sometimes happy life for the retarded")