The Collaborative International Dictionary of English v.0.48:

Displacency \Dis*pla"cen*cy\, n. [LL. displacentia, for L.
   displicentia, fr. displicere to displease; dis- + placere to
   please. See Displease, and cf. Displeasance.]
   Want of complacency or gratification; envious displeasure;
   dislike. [Obs.] --Sir T. Browne.
   [1913 Webster]