the mind > mental capacity > understanding > intelligence, cleverness > high intelligence, genius > [adjective] > esp. of children (3)
Of a person, esp. a child or pupil: quick-witted, clever; intelligent, astute.
Acute or penetrating in intellect or perception. Of persons or their faculties: †(a) Intellectually acute, keen witted, discerning, sagacious (obs…
Having the characteristics of a grown-up person; precocious, intelligent, knowing, cunning.