1.
hard; rigid; stiff; hard-textured
Describing a material or substance that is physically hard, firm, and not easily deformed. Used as a technical or descriptive term for material properties.
硬質なプラスチック。
Hard plastic.
Usage
Used as a no-adjective (硬質な) or as a prefix in compounds. Common in product descriptions, material science, and food terminology (硬質小麦 for durum wheat).