The term WEAKER, AS AN EXCUSE can be summarized by two crossword solutions: LAMER (5 letters) and FLIMSIER (8 letters). LAMER is an informal word meaning 'less convincing or effective' and is often used to describe an excuse that is not very believable. FLIMSIER is a more formal word meaning 'lacking strength or substance' and is often used to describe an excuse that is not very convincing. Both words are used to describe excuses that are not very strong or convincing.