あってはならない

あってはならないattehanaranai

expression · i-adjective

  1. there must be no ...
  2. there should not be any ...
  3. not permitted
  4. impermissible
  5. unacceptable

Study it in Yanamino

Data from JMdict, KANJIDIC2 (EDRDG), KanjiVG, CC-CEDICT and Make Me a Hanzi. Sources and licences