The term 'hardens' can be defined as the process of becoming hard or solid. This term can be represented in a variety of ways, such as enures (6 letters), GELS (4 letters), sets (4 letters), inures (6 letters), STEELS (6 letters), and CONGEALS (8 letters). Enures is the process of becoming dry or firm, while GELS are substances that become solid when cooled. Sets refer to the process of becoming fixed or established, while inures is the process of becoming accustomed to something. STEELS are alloys of iron and carbon, and CONGEALS is the process of becoming thick and sticky.