VEXA'TIOUS, adjective

1. Irritating; disturbing or agitating to the mind; causing disquiet; afflictive; as a vexatious controversy; a vexatious neighbor.

2. Distressing; harassing; as vexatious wars.

3. Full of trouble and disquiet.

He leads a vexatious life.

4. Teasing; slightly troublesome; provoking.

A vexatious suit, in law, is one commenced for the purpose of giving trouble, or without cause.