[syn: annoying, bothersome, galling, irritating, nettlesome, pesky, pestering, pestiferous, plaguy, plaguey, teasing, vexatious, vexing]
The Collaborative International Dictionary of English v.0.48:
Vex \Vex\ (v[e^]ks), v. t. [imp. & p. p. Vexed (v[e^]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]
WordNet (r) 3.0 (2006):
vexing
    adj 1: extremely annoying or displeasing; "his cavelier curtness
           of manner was exasperating"; "I've had an exasperating
           day"; "her infuriating indifference"; "the ceaseless
           tumult of the jukebox was maddening" [syn:
           exasperating, infuriating, maddening, vexing]
    2: causing irritation or annoyance; "tapping an annoying rhythm
       on his glass with his fork"; "aircraft noise is particularly
       bothersome near the airport"; "found it galling to have to
       ask permission"; "an irritating delay"; "nettlesome
       paperwork"; "a pesky mosquito"; "swarms of pestering gnats";
       "a plaguey newfangled safety catch"; "a teasing and
       persistent thought annoyed him"; "a vexatious child"; "it is
       vexing to have to admit you are wrong" [syn: annoying,
       bothersome, galling, irritating, nettlesome, pesky,
       pestering, pestiferous, plaguy, plaguey, teasing,
       vexatious, vexing]
Moby Thesaurus II by Grady Ward, 1.0:
34 Moby Thesaurus words for "vexing":
   aggravating, annoying, bothering, bothersome, disturbing,
   exasperating, galling, harassing, harassment, importunate,
   importune, irking, irksome, irritating, pesky, pestering,
   pestiferous, pestilent, pestilential, plaguesome, plaguey,
   plaguing, provocation, provoking, teasing, tiresome, tormenting,
   troublesome, troubling, vexation, vexatious, wearisome, worrisome,
   worrying