The term 'Flimsy, as an excuse' can be broken down into four crossword solutions: THIN (4 letters), LAME (4 letters), POOR (4 letters), and FEEBLE (6 letters). All of these words are used to describe something that is not strong or convincing. THIN implies a lack of substance, LAME suggests a lack of creativity, POOR implies a lack of quality, and FEEBLE implies a lack of strength. Together, these words paint a picture of an excuse that is weak and unconvincing.