WordNet (r) 3.0 (2006):

oversensitive
    adj 1: unduly sensitive or thin-skinned

Moby Thesaurus II by Grady Ward, 1.0:

45 Moby Thesaurus words for "oversensitive":
   allergic, anaphylactic, delicate, empathetic, empathic, goosy,
   hairsplitting, high-strung, hypercritical, hyperesthetic,
   hyperpathic, hypersensitive, irritable, itchy, miffy,
   morbidly sensitive, nervous, overconscientious, overcritical,
   overfastidious, overmeticulous, overnice, overparticular,
   overprecise, overrefined, overscrupulous, oversensible,
   oversqueamish, overtender, passible, prickly, refined, responsive,
   sensitive, skittish, supersensitive, sympathetic, tactful,
   temperamental, tender, tetchy, thin-skinned, ticklish, touchy,
   ultracritical