The Collaborative International Dictionary of English v.0.48:
Overnice \O"ver*nice"\, a. Excessively nice; fastidious. --Bp. Hall. -- O"ver*nice"ly, adv. -- O"ver*nice"ness, n. [1913 Webster]WordNet (r) 3.0 (2006):
overnice adj 1: excessively fastidious and easily disgusted; "too nice about his food to take to camp cooking"; "so squeamish he would only touch the toilet handle with his elbow" [syn: dainty, nice, overnice, prissy, squeamish]