Meaning of “disloyal” - Learner’s Dictionary

disloyal

adjective uk us /dɪˈslɔɪəl/

not loyal or not supporting someone who you should support:

I don't want to be disloyal to my friend.
disloyalty noun [ U ]

They accused her of disloyalty.

(Definition of “disloyal” from the Cambridge Learner’s Dictionary © Cambridge University Press)