匪石之心 ひせきのこころ Meanings Noun steadfastness; firmness in one's conviction; having a heart that does not change as easily as a stone rolls about Kanji 匪 negation; wicked person. Read as ヒ. 石 stone. Read as セキ. 之 of; this 心 heart. Read as こころ. Word lists Yojijukugo (四字熟語) Jinuma: Japanese Dictionary · Word lists