The term 'fallen apart' can be described by two crossword solutions: 'UNGLUED' (7 letters) and 'UNDONE' (6 letters). Both words refer to something that has been destroyed or broken down, usually due to a lack of care or attention. 'UNGLUED' implies that the object was once held together by glue or some other adhesive, but has since come UNDONE. 'UNDONE' suggests that the object was once in a state of completion, but has since been taken apart or disassembled.