呆(ぼ)けるto grow senile, to be childish with age, to be mentally slow, to be befuddled, to play stupid, to say something stupid (oft. on purpose; esp. as part of a comedic routine), to become engrossed (in something)

Dictionary Definition

Common

る-verb, Intransitive verb
1. 1.
  to grow senile, to be childish with age
  Usually written using kana alone
2. 2.
  to be mentally slow, to be befuddled
  Usually written using kana alone
3. 3.
  to play stupid, to say something stupid (oft. on purpose; esp. as part of a comedic routine)
  Usually written using kana alone
Auxiliary verb, る-verb
1. 4.
  to become engrossed in, to become absorbed in
  after -masu stem of verb, Only applies to ほうける

呆ける【ぼける】、呆ける【ほうける】、惚ける【ぼける】、惚ける【ほうける】、耄ける【ほうける】、ボケる

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ボケてきたが、認知(にんち)症(しょう)だろうか…。

I've started to grow senile, I wonder if it's dementia...?

ピントがボケた写真(しゃしん)なんかいりません。

I don't need a photo that's out of focus.

まだ５０歳(さい)…ボケるには早(はや)すぎると思(おも)います。

I'm only 50... I think it's too early to grow senile.

論点(ろんてん)がボケているから、もう一度(いちど)論点(ろんてん)に返(かえ)った方(ほう)が良(よ)さそうだ。

The main point is becoming off topic, so it seems better to return to the main topic once again.

歳(さい)をとるとともにボケてきた気(き)がして、心配(しんぱい)でしょうがないです。

I feel like I'm growing senile as I age, and I can't help but worry.

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