Meaning 1: "Can withstand / is worthy of" or "not worthy of"
Meaning 2: "Cannot bear / is unbearable" (negative only)
Common noun collocations: 鑑賞、批判、使用、読む(読むに耐えない)、見る(見るに耐えない) Meaning 2 often uses verbs in 連用形 (ます-stem): 見るに耐えない、聞くに耐えない
The expression に耐える (にたえる) and its negative form に耐えない (にたえない) are used in formal or literary contexts with two main meanings depending on the nuance.
When used with certain abstract nouns, に耐える means that something is worthy of or good enough to withstand a particular standard or scrutiny. Common collocations include かんしょう鑑賞にたえる耐える (worthy of appreciation), ひはん批判にたえる耐える (can withstand criticism), and しよう使用にたえる耐える (fit for use).
In this usage, に耐えない means something is not worthy of or not up to the standard. A very common fixed expression is よむ読むにたえない耐えない (not worth reading / too terrible to read).
に耐えない is also used to express that one cannot bear or cannot endure a feeling or situation – the emotion is so strong that it overflows. This is a highly literary and formal usage often seen in written language. Common collocations include かんしゃ感謝にたえない耐えない (cannot contain one's gratitude), どうじょう同情にたえない耐えない (cannot help but feel sympathy), and みる見るにたえない耐えない (too painful/terrible to watch).
The pattern takes either a noun + に耐える/耐えない or a verb (dictionary form) + に耐える/耐えない:
This grammar point is quite formal and literary. In everyday conversation, simpler expressions like 〜~にがまん我慢できない or 〜~のかち価値がある would be more natural.