ichidan verb, transitive verb
ignore (what one hears); overhear and disregard
Used almost exclusively in the negative form 聞き捨てならない, meaning something heard cannot be ignored or let pass. The affirmative form is rare.
See also: 聞き捨てならない
彼のその発言は聞き捨てならない。
I can't just ignore what he said.
I heard a rumor that I can't overlook.