Source : Webster's Revised Unabridged Dictionary (1913)

Haunt \Haunt\ (?; 277), v. t. [imp. & p. p. {Haunted}; p. pr. &
   vb. n. {Haunting}.] [F. hanter; of uncertain origin, perh.
   from an assumed LL. ambitare to go about, fr. L. ambire (see
   {Ambition}); or cf. Icel. heimta to demand, regain, akin to
   heim home (see {Home}). [root]36.]
   1. To frequent; to resort to frequently; to visit
      pertinaciously or intrusively; to intrude upon.

            You wrong me, sir, thus still to haunt my house.
                                                  --Shak.

            Those cares that haunt the court and town. --Swift.

   2. To inhabit or frequent as a specter; to visit as a ghost
      or apparition.

            Foul spirits haunt my resting place.  --Fairfax.

   3. To practice; to devote one's self to. [Obs.]

            That other merchandise that men haunt with fraud . .
            . is cursed.                          --Chaucer.

            Leave honest pleasure, and haunt no good pastime.
                                                  --Ascham.

   4. To accustom; to habituate. [Obs.]

            Haunt thyself to pity.                --Wyclif.

Source : WordNet®

haunting
     adj 1: continually recurring to the mind; "haunting memories"; "the
            cathedral organ and the distant voices have a haunting
            beauty"- Claudia Cassidy [syn: {persistent}]
     2: having a deeply disquieting or disturbing effect; "from two
        handsome and talented young men to two haunting horrors of
        disintegration"-Charles Lee