clever person; smart person
Refers to someone who is sharp, sensible, or quick-witted. Often used with a nuance of being shrewd or knowing how to handle situations well.
He's a clever person, so he can solve difficult problems right away.
That child is smart and never forgets what they hear once.
Compound of 利口 (rikō, 'clever') and 者 (mono, 'person'). The exact historical derivation is uncertain, but the spelling is conventionally associated with the meaning.