The crossword solutions for the term IS PRONE are LIES (4 letters) and SEESFIT (7 letters). The term 'is prone' means to be likely or liable to suffer from, do, or experience something. LIES is a verb meaning to tell an untruth or to present false information. SEESFIT is an idiom meaning to consider it appropriate or necessary to do something. Therefore, the two crossword solutions together suggest that someone is likely to tell untruths or present false information if they consider it necessary.