用心(ようじん) ようじん noun caution, precaution 1. caution, precaution, vigilance Care taken to avoid danger or mistakes; being careful and watchful. 火(ひ)の用心(ようじん)をしてください。 Please be careful with fire. 火の用心 = fire safety/prevention 用心(ようじん)に越(こ)したことはない。 You can't be too careful. Common saying meaning 'better safe than sorry' 夜道(よみち)は用心(ようじん)して歩(ある)いた方(ほう)がいい。 You should walk carefully on the streets at night. USAGE: 用心(ようじん) emphasizes being careful to prevent problems or danger. It's often used with する to form a verb.COMMON PATTERNS:用心(ようじん)する (to be careful, to take precautions)火(ひ)の用心(ようじん) (fire safety/prevention)用心(ようじん)に越(こ)したことはない (can't be too careful)用心深(ようじんぶか)い (cautious, wary)用心棒(ようじんぼう) (bodyguard)SIMILAR WORDS:注意(ちゅうい) - attention, caution警戒(けいかい) - vigilance, precaution Related Words Synonym: 注意(ちゅうい) (general caution) Synonym: 警戒(けいかい) (vigilance, alertness) general Added 2026.1.13 1:05 · Revised 2026.5.27 5:08 03500/03659_youjin