けんにんふばつ 堅忍不抜 LinksSentence search for 堅忍不抜Sentence search for けんにんふばつKanji details for 堅, 忍, 不 and 抜Edit in JMdict Na-adjective (keiyodoshi), Noun1. indomitable perseverance; invincible fortitudeYojijukugo (four character compound) Discussions Log in to talk about this word.