堅忍不抜 けんにんふばつ Meanings な-adjective, Noun indomitable perseverance; invincible fortitude Kanji 堅 firm. Read as ケン. 忍 stealth. Read as ニン. 不 un- 抜 pull out. Read as バツ. Word lists Yojijukugo (四字熟語) Jinuma: Japanese Dictionary · Word lists