Contracting 〜らない to 〜んない
Grammar: Colloquial and Casual Speech
Casual speech may contract 〜らない to 〜んない. A common example is 分からない → 分
Examples
Don't know with わかんない

Nako learns of Bocchi’s necessity to become friends with everyone in class.
- なこ:
- 「全員
( と友達( かー」- “Friends with the whole class, huh?”
- 「大丈夫
( なのかー?」- “Will you be okay...?”
- “Friends with the whole class, huh?”
- ぼっち:
- 「わかんないでも頑張
( る!」- “I don't know, but I'll try my best!”