惚ける

とぼける, ほうけるtobokeru

ichidan verb · intransitive · auxiliary

1. to play dumb
2. to feign ignorance
3. to play innocent
4. to have a blank facial expression
5. to play the fool
6. to be in one's dotage
7. to be mentally slow
8. to be befuddled

Study it in Yanamino