early 15c., from Middle French desloyaulte, from Old French desloiaute, desleauté "disloyalty, faithlessness, marital infidelity," from desloial (see disloyal). Especially of allegiance to a state or sovereign since c. 1600.
1. Charges had already been made against certain officials suspected of disloyalty.
2. Only death could have forced that disloyalty from Melanie.
3. He hated happiness bought with disloyalty and cruelty and indifference.
4. They may even accuse the child of disloyalty.
5. With such a state of national unity the problem of disloyalty or isolationism scarcely existed.