かい 甲斐がない Show inflections LinksSentence search for 甲斐がないSentence search for かいがないSentence search for 甲斐が無いKanji details for 甲 and 斐Edit in JMdict Expressions (phrases, clauses, etc.), I-adjective (keiyoushi)1. useless; in vainOther forms甲斐が無い 【かいがない】 Discussions Log in to talk about this word.