Perceptive, intelligent, clever, savvy, perspicacious, canny, sharp...
Smart, intelligent, perceptive
Both are correct.
Synonym means: a word having the same or nearly the same meaning as another in the language. Definition means: the act of defining or making definite, distinct, or clear / the formal statement of the...
The word no can be replaced in some contexts by none, negative, zero, or nothing.