道心堅固 どうしんけんご Meanings Noun, な-adjective being of firm (unshakable) faith and strict practice Kanji 道 road. Read as ドウ. 心 heart. Read as シン. 堅 firm. Read as ケン. 固 solid. Read as コ. Word lists Yojijukugo (四字熟語) Jinuma: Japanese Dictionary · Word lists