Vexatious \Vex*a"tious\, a. [See Vexation.] 1. Causing vexation; agitating; afflictive; annoying; as, a vexatious controversy; a vexatious neighbor. ``Continual vexatious wars.'' --South. 2. Full or vexation, trouble, or disquiet; disturbed. He leads a vexatious life. --Sir K. Digby. Vexatious suit (Law), a suit commenced for the purpose of giving trouble, or without cause. -- Vex*a"tious*ly, adv. -- Vex*a"tious*ness, n.