Synonyms:
brainy, brilliant, smart_as_a_whip
Meaning: having or marked by unusual and impressive intelligence; "some men dislike brainy women"; "a brilliant mind"; "a brilliant solution to the problem"
Usage examples
"To begin with, there was a rusty nail in my clam cocktail, and it nearly choked me to death. I tried hard to keep Mrs. Innitt from seeing what had happened, but she is watchful if not brainy, and all my efforts went for naught.