The term 'most feeble' can be defined by four different crossword solutions: WEAKEST (7 letters), frailest (8 letters), lamest (6 letters) and palest (6 letters). WEAKEST is the most general term, meaning having the least strength or power. Frailest implies a physical fragility, while lamest and palest both refer to a lack of vigor or energy. All four words can be used to describe someone or something that is very weak or feeble.