Source : Webster's Revised Unabridged Dictionary (1913)

Plaguy \Pla"guy\, a.
   Vexatious; troublesome; tormenting; as, a plaguy horse.
   [Colloq.] Also used adverbially; as, ``He is so plaguy
   proud.'' --Shak.

Source : WordNet®

plaguy
     adj : 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}, {plaguey}, {teasing}, {vexatious}, {vexing}]
     adv : in a disagreeable manner; "it's so plaguey cold!" [syn: {plaguey},
            {plaguily}]