Definitions

1. adjective

disloyal; not faithful or devoted in one’s allegiance, duty, or obligation

“She accused her former friend of being unloyal when she didn’t attend her wedding.”

2. adverb

in a disloyal manner

“He acted unloyal towards his colleagues by stealing their ideas.”

3. noun

a person who is disloyal or not faithful in one’s allegiance, duty, or obligation

“The unloyal employee was fired from the company for his dishonesty.”