expression, suru verb (irregular)
Used almost exclusively in the negative form 聞き捨てにできない or 聞き捨てにならない, meaning something cannot be ignored or left unheard. Often used when a remark is too important, offensive, or surprising to dismiss.
See also: 聞き捨てならない
彼の失礼な発言は聞き捨てにできなかった。
I couldn't just ignore his rude remark.
そのニュースは聞き捨てにならない内容だった。
The news was something I couldn't just pass over.