Endowed with intellect; having a keen sense of understanding; having the capacity for higher forms of knowledge or thought; characterized by intelligence or cleverness
Relating to the understanding; treating of the mind.
Suitable for exercising one's intellect; perceived by the intellect
Pertaining to, or performed by, the intellect; mental or cognitive.
An intelligent, learned person, especially one who discourses about learned matters.
Of art or other things: appealing to the tastes of an intellectual or sophisticated (sense 1) person; cerebral; also, cultured, elegant, refined.
Of a person: having obtained worldly experience, and lacking naiveté; cosmopolitan, worldly-wise.
Complicated, especially of complex technology.