意志堅固 いしけんご Meanings Noun, な-adjective strong determination; strong-willed; having strong will power; firmness of purpose Kanji 意 mind. Read as イ. 志 aspire 堅 firm. Read as ケン. 固 solid. Read as コ. Word lists Yojijukugo (四字熟語) Jinuma: Japanese Dictionary · Word lists