The term UNFIRM is a combination of two words, 'un' and 'FIRM, ' which means not FIRM or weak. It can be used to describe a person's physical state, such as being unable to stand up straight due to a lack of strength, or it can be used to describe a person's mental state, such as being indecisive or uncertain. It can also be used to describe an object, such as a structure that is not stable or secure. In the context of the crossword puzzle, the answer LIMP is a synonym for UNFIRM.