硬質 こうしつ Meanings Noun, の-adjective hardness; stiffness Kanji 硬 hard. Read as コウ. 質 quality. Read as シツ. Words containing 硬質 硬質陶器 (こうしつとうき) ironstone china 硬質ゴム (こうしつゴム) hard rubber (e.g. ebonite, vulcanite) 硬質ガラス (こうしつガラス) hard glass And 1 more. Jinuma: Japanese Dictionary · Word lists