na-adjective, noun
clever; intelligent; bright; smart; wise; sensible; shrewd
Describes a person or animal that is mentally sharp, quick-witted, or shows good judgment. Can be used for both natural intelligence and sensible behavior.
彼はとても利口な学生だ。
He is a very bright student.
あの犬は利口で、すぐに芸を覚える。
That dog is clever and learns tricks quickly.
na-adjective, noun
Especially for children and pets, often with the honorific prefix お (お利口). Implies being quiet, following rules, and not causing trouble.
See also: お利口
お利口に座っていてね。
Sit still and be good, okay?
うちの子はお利口で、いつも静かに遊んでいる。
My child is well-behaved and always plays quietly.