Dictionary/硬質こうしつKoushitsu硬質 (Koushitsu) is a Japanese noun meaning “hardness, stiffness”.Meaningsnoun, adjectival nounhardness; stiffnessKanji in 硬質硬stiff質substanceRelated words質問question人質hostage硬いhard質quality体質constitution (physical)物質material悪質malicious本質essence質屋pawnshop品質quality (of a product or a service)気質disposition性質nature (of a person)