A vexing question is a difficult or confusing question that is hard to answer. It is often used as a metaphor for a problem or situation that is difficult to solve. The term 'vexing question' can also be used to describe a situation in which there is no clear answer or solution. The crossword solution for the term 'vexing question' is 'RIDDLE, ' which is a type of puzzle or problem that requires creative thinking and problem-solving skills to solve.