〜もしない
Formation
Meaning
Expresses strong dissatisfaction or criticism towards someone for not doing something at all, or failing to perform even a basic action.
Note
A strong negative emphasis used when an expected or obvious action is not carried out. It often conveys the speaker's frustration, annoyance, or criticism (e.g., 'not even saying thank you'). It connects to the masu-stem (without 'masu') of verbs. For Group 3 verbs like 'する', it usually becomes 'しもしない'.
Examples
彼は私の話を聞きもしないで、自分の意見ばかり言っている。
He doesn't even listen to what I'm saying and just keeps stating his own opinion.
準備を始めもしないで、もうすぐ出発だなんて信じられない。
I can't believe we're about to leave soon without having even started the preparations.
中身を見もしないで、美味しくないと言うのは失礼だ。
It's rude to say something isn't tasty without even looking at what's inside.
一歩も動きもしないで、じっとこちらを見つめている。
They are staring fixedly over here without moving a single step.
謝りもしないで帰ってしまうなんて、ひどすぎる。
Leaving without even apologizing is just too much (too cruel).
調べもしないで、分からないと言うのは早すぎる。
It's too early to say you don't understand without even looking into it.