~ねえ (rough ~ない)
grammar4 sentences
The rough-masculine contraction of ~ない where the い elides and the ai vowels slur into ē — written variably as ~ねえ or ~ねー (long-vowel mark): 分からねえ/分からねー (= 分からない), しねえ/しねー (= しない), くだらねえ ('stupid'). Marks casual or aggressive male speech; characteristic of certain dialects and rare in writing outside of dialogue.