Be disputatious is an adjective that describes someone who is argumentative or prone to arguing. It is derived from the Latin word 'disputare' which means to debate or DISPUTE. The term can be used to describe someone who is always looking for a fight or who is quick to disagree with others. In the crossword, the solution to the clue 'ARGUE' (5 letters) is 'DISPUTE', which is closely related to the term 'be disputatious'.