ぶようじん 不用心 LinksSentence search for 不用心Sentence search for ぶようじんSentence search for 無用心Sentence search for ふようじんKanji details for 不, 用 and 心Edit in JMdict Na-adjective (keiyodoshi), Noun1. unsafe; insecure; careless; dangerous; incautious; imprudentOther forms無用心 【ぶようじん】、不用心 【ふようじん】 Discussions Log in to talk about this word.