こころあ 心当たりのない Show inflections LinksSentence search for 心当たりのないSentence search for こころあたりのないKanji details for 心 and 当Edit in JMdict Expressions (phrases, clauses, etc.), I-adjective (keiyoushi)1. completely unknown; unexpected; having no clue aboutSee also 心当たりがない Discussions Log in to talk about this word.