Help to understand difference between に堪える/に堪えない/に耐える/にたえない


この活動が社会に認められることは、誠に喜び。。。。  
A.にたえません  
B.にたりません  
C.に当たりません  
D.にかたくありません  
The answer is A にたえません  
First there are two words: に堪えない and に耐えません , with different 漢字 of course
different meaning  
に堪えない: can't suppress emotions(?)抑えない  
But also means ~だけの価値がある？  
に耐えない: can't stand to do  

According to the sentence above, it is suppose to express emotion of happiness  
人の悪口は聞くに堪えない  
この説はまだ証拠が少なく、詳細な議論に堪えるものではない (This opinion still has little evidence and does
not fit/worth a detailed discussion)

So what I want to ask is what is the real meaning of に堪える/にたえない It expresses
worth/not worth doing something, but also has meaning to express strong
emotion like 喜びに堪えません(？)  
喜びに堪えません: not worth to feel happy/really happy? Thank you!!!




〜に堪えない is rather idiomatic.  

> **終止形(辞書形, dictionary form)** + **に堪えない**

In this case 堪えない means " _not worth doing_ ", and by extension " _cannot do
it because it is unpleasant._ "

> **enotional noun(e.g. 喜び, 悲しみ)** + **に堪えない**

Here 堪えない means " _cannot help feeling_ " or " _cannot suppress emotions_ "

By the way, 感に堪えない and 感に堪える is the same meaning " _be impressed deeply_."
Such a phenomenon sometimes occurs in Japanese. e.g 満遍なく-満遍に(the latter is
obsolete), おぼろけなり-おぼろけならず(old Japanese), 何気なく-何気に(the latter is slangy)




〜に堪えない is rather idiomatic.  

> **終止形(辞書形, dictionary form)** + **に堪えない**

In this case 堪えない means " _not worth doing_ ", and by extension " _cannot do
it because it is unpleasant._ "

> **enotional noun(e.g. 喜び, 悲しみ)** + **に堪えない**

Here 堪えない means " _cannot help feeling_ " or " _cannot suppress emotions_ "

By the way, 感に堪えない and 感に堪える is the same meaning " _be impressed deeply_."
Such a phenomenon sometimes occurs in Japanese. e.g 満遍なく-満遍に(the latter is
obsolete), おぼろけなり-おぼろけならず(old Japanese), 何気なく-何気に(the latter is slangy)

