聞き捨てならない could be an inflection of 聞き捨てる, with these forms:
- Nai-form. It indicates the negative form of the verb.
Kanji — 2 found
1.8552578968412634
14 strokes.
JLPT N5.
Jōyō kanji, taught in grade 2.
hear,
ask,
listen