Lose solidity is a term used to describe the process of a material becoming less rigid or firm. This can be caused by a variety of factors, such as heat, pressure, or chemical reactions. The two crossword solutions for this term are WILT and MELT. WILT is a term used to describe the process of a plant or flower becoming limp or drooping due to lack of water or other environmental factors. MELT is a term used to describe the process of a solid material becoming liquid due to an increase in temperature. Both of these processes can cause a material to lose its solidity.