'Disloyalty' definitions:

Definition of 'disloyalty'

From: WordNet
noun
The quality of being disloyal [ant: loyalty, trueness]

Definition of 'Disloyalty'

From: GCIDE
  • Disloyalty \Dis*loy"al*ty\, n. [Pref. dis- + loyalty: cf. OF. desloiaut['e], deslealt['e], F. d['e]loyaut['e].] Want of loyalty; lack of fidelity; violation of allegiance. [1913 Webster]