The Collaborative International Dictionary of English v.0.48:

Supersensitive \Su`per*sen"si*tive\, a.
   Excessively sensitive; morbidly sensitive. --
   Su`per*sen"si*tive*ness, n.
   [1913 Webster]

WordNet (r) 3.0 (2006):

supersensitive
    adj 1: having an allergy or peculiar or excessive susceptibility
           (especially to a specific factor); "allergic children";
           "hypersensitive to pollen" [syn: allergic,
           hypersensitive, hypersensitized, hypersensitised,
           sensitized, sensitised, supersensitive,
           supersensitized, supersensitised]

Moby Thesaurus II by Grady Ward, 1.0:

29 Moby Thesaurus words for "supersensitive":
   allergic, anaphylactic, delicate, empathetic, empathic, goosy,
   hyperesthetic, hyperpathic, hypersensitive, irritable, itchy,
   nervous, overrefined, oversensible, oversensitive, overtender,
   passible, prickly, refined, responsive, sensitive, skittish,
   sympathetic, tactful, tender, tetchy, thin-skinned, ticklish,
   touchy