The Collaborative International Dictionary of English v.0.48:

Flout \Flout\, v. t. [imp. & p. p. Flouted; p. pr. & vb. n.
   Flouting.] [OD. fluyten to play the flute, to jeer, D.
   fluiten, fr. fluit, fr. French. See Flute.]
   To mock or insult; to treat with contempt.
   [1913 Webster]

         Phillida flouts me.                      --Walton.
   [1913 Webster]

         Three gaudy standards flout the pale blue sky. --Byron.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Flout \Flout\, v. i.
   To practice mocking; to behave with contempt; to sneer; to
   fleer; -- often with at.
   [1913 Webster]

         Fleer and gibe, and laugh and flout.     --Swift.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Flout \Flout\, n.
   A mock; an insult.
   [1913 Webster]

         Who put your beauty to this flout and scorn.
                                                  --Tennyson.
   [1913 Webster]

WordNet (r) 3.0 (2006):

flout
    v 1: treat with contemptuous disregard; "flout the rules" [syn:
         scoff, flout]
    2: laugh at with contempt and derision; "The crowd jeered at the
       speaker" [syn: jeer, scoff, flout, barrack, gibe]

Moby Thesaurus II by Grady Ward, 1.0:

138 Moby Thesaurus words for "flout":
   Parthian shot, abase, affront, aspersion, atrocity, back answer,
   barrack, belittle, blaspheme, break, break the law, brickbat,
   call names, care naught for, caustic remark, chaff, comeback,
   contemn, contempt, contravene, contumely, crack, cut, cut at,
   cutting remark, decry, defy, degrade, denigrate, denounce,
   deprecate, depreciate, deride, despise, despite, dig, dig at,
   disdain, dishonor, disobey, disoblige, disparage, disregard,
   do violence to, dump, dump on, enormity, fleer, fleer at, flouting,
   foolery, gibe, gibe at, gibing retort, gird, give offense to,
   go counter to, guy, hold in derision, humiliate, humiliation,
   hurl a brickbat, ignore, indignity, infringe, injury, insult, jab,
   jab at, jape, jeer, jeer at, jeering, jest, jibe at, knock,
   laugh at, laugh to scorn, leg-pull, minimize, misprize, mock,
   mockery, not conform, not heed, not keep, not listen, not mind,
   not observe, offend, offense, outrage, parting shot, pooh,
   pooh-pooh, put down, put-down, put-on, quip, rag, rail at, rally,
   rank out, refuse to cooperate, repudiate, revile, ridicule,
   rude reproach, scoff, scoff at, scorn, scout, scurrility,
   set at defiance, set at naught, set naught by, short answer, slam,
   slap, slap at, slight, slight over, sneer, sneer at, spurn, swipe,
   taunt, trample on, trample underfoot, trample upon, transgress,
   treat with contempt, treat with indignity, trespass, twit,
   uncomplimentary remark, verbal thrust, violate