用よう心じん堅けん固ごConjugationsMeaningsNounNa-adjective1. very cautious (watchful, vigilant); taking every possible precautionKanji used用used for心heart堅firm固solidifyComposed of用よう心じんcare; precaution; guarding; cautionNoun堅けん固ごsolid; strong; firmNa-adjective