ようじん 用心 Common word JLPT N3 LinksSentence search for 用心Sentence search for ようじんSentence search for 要心Kanji details for 用 and 心Edit in JMdict Noun, Suru verb, Transitive verb, Intransitive verb1. care; precaution; guarding; cautionOther forms要心 【ようじん】Notes要心: Rarely-used kanji form. Discussions Log in to talk about this word.