Source : Webster's Revised Unabridged Dictionary (1913)

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.

Source : WordNet®

vexatious
     adj : causing irritation or annoyance; "tapping an annoying rhythm
           on his glass with his fork"; "aircraft noise is
           particularly bothersome near the airport"; "found it
           galling to have to ask permission"; "an irritating
           delay"; "nettlesome paperwork"; "a pesky mosquito";
           "swarms of pestering gnats"; "a plaguey newfangled
           safety catch"; "a teasing and persistent thought
           annoyed him"; "a vexatious child"; "it is vexing to
           have to admit you are wrong" [syn: {annoying}, {bothersome},
            {galling}, {irritating}, {nettlesome}, {pesky}, {pestering},
            {pestiferous}, {plaguy}, {plaguey}, {teasing}, {vexing}]