Underdone is a term used to describe food that has not been cooked enough. It is the opposite of overdone, which is when food has been cooked too much. The crossword solutions for the term UNDERDONE are RED (3 letters), RAW (3 letters), and RARE (4 letters). RED and RAW refer to food that has not been cooked at all, while RARE refers to food that has been cooked slightly but not enough to be considered fully cooked.