甚だしい

i-adjectiveはなはだしい · hanahadashii

1. Englishextreme; excessive; terrible; intense

   • あんなことを彼女に言うなんて非常識も甚だしい。It's quite absurd of you to tell her that sort of thing.

Source: JMdict (EDRDG) · CC BY-SA 4.0 (EDRDG)