白痴

1. noun, sensitive idiot; idiocy
2. dated, medicine profound mental retardation

たわけ also 戯け

1. noun, usually in kana tomfoolery; foolish act; nonsense
2. usually in kana fool; idiot

1. noun, work of art, literature, music, etc. name The Idiot (1868 novel by Fyodor Dostoevsky)