惚ける[ぼける] (bokeru)

祖父そふは 少すこしだけぼけている

My grandfather has become just a little senile.

最近、物忘れが激しくて。少しボケてきたのかな？

Could I be going soft in the head? I forget things so easily these days.

台所でころんで以来彼女はぼけてしまった。

Ever since she fell in the kitchen, she hasn't been all there.

彼はこのごろ頭がぼけてきた。

He had grown senile recently.

写真、ちょっとボケてるよ。

The photograph is a little blurry.

千ちゃんこそねぼけているぞ。