ないといけない Common word Show inflections LinksSentence search for ないといけないKanji details for 行Edit in JMdict Expressions (phrases, clauses, etc.), I-adjective (keiyoushi)1. have to (verb); must (verb)Usually written using kana alone, See also なくてはいけない, after negative base of verbExpressions (phrases, clauses, etc.), I-adjective (keiyoushi)2. is indispensable; absolutely necessaryUsually written using kana alone, See also なくてはいけない Discussions Log in to talk about this word.