Synonyms for Prissy (same or very similar meaning)
WordNet sense 1 (exaggeratedly proper):
priggish, prim, prudish, puritanical, straitlaced, square-toed, straightlaced, straight-laced, strait-laced, tight-laced, VictorianWordNet sense 2 (marked by suitability or rightness or appropriateness):
properWordNet sense 3 (excessively fastidious and easily disgusted):
dainty, nice, overnice, squeamishWordNet sense 4 (giving careful attention to detail; hard to please; excessively concerned with cleanliness):
fastidiousFrom the ODE community, based on WordNetadd/edit