The Collaborative International Dictionary of English v.0.48:

Mincing \Min"cing\, a.
   That minces; characterized by primness or affected nicety.
   [1913 Webster]

WordNet (r) 3.0 (2006):

mincing
    adj 1: affectedly dainty or refined [syn: dainty, mincing,
           niminy-piminy, prim, twee]