Vexatious /(?)/

Vex·a·tious

Vexatious

a.
  1. Causing vexation; agitating; afflictive; annoying; as, a vexatious controversy; a vexatious neighbor.
  2. Full of vexation, trouble, or disquiet; disturbed.
    He leads a vexatious life.
    — Sir K. Digby.

Phrases & Compounds

Vexatious suit
a suit commenced for the purpose of giving trouble, or without cause.