intellectual

adjective

1
appealing to or using the intellect
satire is an intellectual weapon
intellectual workers engaged in creative literary or artistic or scientific labor
2
of or associated with or requiring the use of the mind
intellectual problems
the triumph of the rational over the animal side of man
3
involving intelligence rather than emotions or instinct
a cerebral approach to the problem
cerebral drama

Also useful for “intellectual”:Crossword— A long fill for tough grids