〜にたえない・〜にたえる
unbearable to (see / hear); worthy of; deeply (grateful)
Verb dictionary form (見る, 聞く, 読む) + にたえない · Noun + にたえる · 感謝 / 遺憾 + にたえない
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にたえない (に堪えない) has two uses:
- Too awful to bear, after 見る, 聞く or 読む: 彼の歌は聞くにたえない, "his singing is unbearable to listen to".
- Overwhelmed with a feeling, in formal speech: 感謝にたえません, "I'm deeply grateful". 遺憾にたえない means "deeply regrettable".
The positive にたえる means "worth, able to stand up to": 大人の鑑賞にたえる作品, "a work that stands up to adult appreciation".
たえる (堪える) means "to endure, withstand". So the puzzle is to read the sentence: praise needs たえる, an awful sight or sound needs たえない, and a formal thank-you needs たえません.
Compare にかたくない, "not hard to".
Examples
彼の歌は聞くにたえない。
His singing is unbearable to listen to.
見るにたえないひどい映像だった。
The footage was too awful to watch.
これは大人の鑑賞にたえる作品だ。
This is a work that stands up to adult appreciation.
皆様のご支援には、感謝にたえません。
I'm deeply grateful for all your support.
誤字だらけで、読むにたえない文章だ。
It's so full of typos that it's unbearable to read.