[1] : The Collaborative International Dictionary of English v.0.48

vex \vex\, v. i.
   to be irritated; to fret. r. --chapman.
   1913 webster

[2] : The Collaborative International Dictionary of English v.0.48

vex \vex\ ve^ks, v. t. imp.  p. p. vexed ve^kst; p.
   pr.  vb. n. vexing. f. vexer, l. vexare, vexatum, to
   vex, originally, to shake, toss, in carrying, v. intens. fr.
   vehere, vectum, to carry. see vehicle.
   1. to toss back and forth; to agitate; to disquiet.
      1913 webster

            white curl the waves, and the vexed ocean roars.
                                                  --pope.
      1913 webster

   2. to make angry or annoyed by little provocations; to
      irritate; to plague; to torment; to harass; to afflict; to
      trouble; to tease. "i will not vex your souls." --shak.
      1913 webster

            ten thousand torments vex my heart.   --prior.
      1913 webster

   3. to twist; to weave. r.
      1913 webster

            some english wool, vexed in a belgian loom.
                                                  --dryden.
      1913 webster

   syn: see tease.
        1913 webster
see also:
vexed vexing vehicle tease 

[3] : WordNet (r) 2.0

vex
     v 1: cause annoyance in; disturb, especially by minor
          irritations; "mosquitoes buzzing in my ear really
          bothers me"; "it irritates me that she never closes the
          door after she leaves" syn: annoy, rag, get to, bother,
           get at, irritate, rile, nark, nettle, gravel,
           chafe, devil
     2: disturb the peace of mind of; afflict with mental agitation
        or distress; "i cannot sleep--my daughter's health is
        worrying me" syn: worry ant: reassure
     3: change the arrangement or position of syn: agitate, disturb,
         commove, shake up, stir up, raise up
     4: subject to prolonged examination, discussion, or
        deliberation; "vex the subject of the death penalty"
     5: be a mystery or bewildering to; "this beats me"; "got me--i
        don't know the answer"; "a vexing problem"; "this
        question really stuck me" syn: perplex, stick, get,
         puzzle, mystify, baffle, beat, pose, bewilder,
         flummox, stupefy, nonplus, gravel, amaze, dumbfound
see also:
annoy rag get to bother get at irritate 
rile nark nettle gravel chafe 
devil worry reassure agitate disturb 
commove shake up stir up raise up perplex 
stick get puzzle mystify baffle 
beat pose bewilder flummox stupefy 
nonplus amaze dumbfound 

[4] : Moby Thesaurus II by Grady Ward, 1.0

87 moby thesaurus words for "vex":
   abrade, aggravate, ail, anger, annoy, arouse, badger, bait, be at,
   be the matter, bedevil, beset, bother, bristle, brown off, bug,
   bullyrag, burn up, chafe, chaw, chivy, complicate matters, concern,
   devil, discommode, discompose, distemper, distress, disturb, dog,
   embarrass, embitter, exasperate, exercise, fash, fret, gall, get,
   gripe, harass, harry, haunt, heckle, hector, hound, huff, incense,
   inconvenience, inflame, infuriate, irk, irritate, miff, molest,
   nag, needle, nettle, nudzh, peeve, perplex, persecute, perturb,
   pester, pick on, pique, plague, pluck the beard, pother, provoke,
   put out, put to it, puzzle, rankle, ride, rile, roil, ruffle,
   set up, stir the blood, stir up, tease, torment, trouble,
   try the patience, tweak the nose, work up, worry

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