Vexatious
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.