Source : Webster's Revised Unabridged Dictionary (1913)

Trifle \Tri"fle\, v. i. [imp. & p. p. {Trifled}; p. pr. & vb. n.
   {Trifling}.] [OE. trifelen, truflen. See {Trifle}, n.]
   To act or talk without seriousness, gravity, weight, or
   dignity; to act or talk with levity; to indulge in light or
   trivial amusements.

         They trifle, and they beat the air about nothing which
         toucheth us.                             --Hooker.

   {To trifle with}, to play the fool with; to treat without
      respect or seriousness; to mock; as, to trifle with one's
      feelings, or with sacred things.

Trifling \Tri"fling\, a.
   Being of small value or importance; trivial; paltry; as, a
   trifling debt; a trifling affair. -- {Tri"fling*ly}, adv. --
   {Tri"fling*ness}, n.

Source : WordNet®

trifling
     adj : not worth considering; "he considered the prize too paltry
           for the lives it must cost"; "piffling efforts"; "a
           trifling matter" [syn: {negligible}, {paltry}]
     n : the deliberate act of wasting time instead of working [syn:
         {dalliance}, {dawdling}, {wasting time}]