The crossword solution for the term 'SLIPPERY AS AN EEL' is 'EVASIVE'. EVASIVE means to avoid or try to avoid giving a direct answer or making a commitment. It is often used to describe someone who is difficult to pin down or catch. This phrase is often used to describe someone who is very difficult to catch or pin down, as an eel is known for its slippery nature and ability to quickly move away from danger.