The Collaborative International Dictionary of English v.0.48:

Itchy \Itch"y\, a.
   1. Infected with the itch. --Cowper.
      [1913 Webster]

   2. Having an itching sensation.
      [1913 Webster]

WordNet (r) 3.0 (2006):

itchy
    adj 1: nervous and unable to relax; "a constant fretful stamping
           of hooves"; "a restless child" [syn: antsy, fidgety,
           fretful, itchy]
    2: causing an irritating cutaneous sensation; being affect with
       an itch; "he had an itchy toe from the mosquito bite"

Moby Thesaurus II by Grady Ward, 1.0:

57 Moby Thesaurus words for "itchy":
   acquisitive, agape, agog, all agog, allergic, anaphylactic,
   burning with curiosity, consumed with curiosity, curious, delicate,
   desirous, empathetic, empathic, ghoulish, goosy, gossipy, grabby,
   grasping, greedy, hyperesthetic, hyperpathic, hypersensitive,
   inquiring, inquisitive, interested, irritable, itching, morbid,
   morbidly curious, nervous, open-eyed, openmouthed, overcurious,
   overrefined, oversensible, oversensitive, overtender, passible,
   prehensile, prickly, prurient, quizzical, refined, responsive,
   scopophiliac, sensitive, skittish, supercurious, supersensitive,
   sympathetic, tactful, tender, tetchy, thin-skinned, ticklish,
   touchy, voyeuristic