Starching is a process of treating fabric with a stiffening agent, such as starch, to give it a crisp, FORMAL look. The crossword solutions for the term 'starched' include 'SOLIDIFIED' (10 letters), 'HARDENED' (8 letters), 'FORMAL' (6 letters), 'STIFF' (5 letters), and 'STIFFENED' (9 letters). All of these words describe the process of starching fabric, which involves treating the fabric with a stiffening agent to give it a more solid, HARDENED, FORMAL, and STIFF appearance.