不ふ用よう心じんConjugationsMeaningsNa-adjectiveNoun1. unsafe; insecure; careless; dangerous; incautious; imprudentOther readings不ぶ用よう心じん無ぶ用よう心じんKanji used不negative用used for心heartComposed of不ふ用ようdisused; unused; useless; wasteful; of no useNa-adjective心しんheart; mind; spirit; vitality; inner strength; bottom of one's heart; core (of one's character); nature; centre; center; …Noun