Without cause is a term used to describe an action that is done without any justification or reason. It can be used to describe an unjustified act, or an act that is done without any legal basis. The two crossword solutions for this term are 'UNDULY' and 'BASELESS'. UNDULY means 'excessively or improperly', while BASELESS means 'having no foundation or basis in fact'. Therefore, both words can be used to describe an action that is done without cause.