pesky

from WordNet (r) 3.0 (2006)

pesky
    adj 1: 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}]

from The Collaborative International Dictionary of English v.0.48

Pesky \Pes"ky\, a. [Etymol. uncertain.]
   Pestering; vexatious; troublesome. Used also as an intensive.
   [Colloq. & Low, U.S.] --Judd.
   [1913 Webster]

from Moby Thesaurus II by Grady Ward, 1.0

43 Moby Thesaurus words for "pesky":
      aggravating, annoying, awful, awfully, bothering, bothersome,
      damned, disturbing, dreadful, dreadfully, exasperating, extremely,
      galling, harassing, importunate, importune, irking, irksome,
      irritating, mean, monstrous, pestering, pestiferous, pestilent,
      pestilential, plaguesome, plaguey, plaguing, provoking, teasing,
      terribly, tiresome, tormenting, troublesome, troubling, troublous,
      ugly, vexatious, vexing, wearisome, wicked, worrisome, worrying