Source : Webster's Revised Unabridged Dictionary (1913)

Flippant \Flip"pant\, a. [Prov. E. flip to move nimbly; cf. W.
   llipa soft, limber, pliant, or Icel. fleipa to babble,
   prattle. Cf. {Flip}, {Fillip}, {Flap}, {Flipper}.]
   1. Of smooth, fluent, and rapid speech; speaking with ease
      and rapidity; having a voluble tongue; talkative.

            It becometh good men, in such cases, to be flippant
            and free in their speech.             --Barrow.

   2. Speaking fluently and confidently, without knowledge or
      consideration; empty; trifling; inconsiderate; pert;
      petulant. ``Flippant epilogues.'' --Thomson.

            To put flippant scorn to the blush.   --I. Taylor.

            A sort of flippant, vain discourse.   --Burke.

Flippant \Flip"pant\, n.
   A flippant person. [R.] --Tennyson.

Source : WordNet®

flippant
     adj : showing inappropriate levity [syn: {light-minded}]