Lacking loyalty. See Synonyms at faithless.(adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "disloyal" in a sentence
"Indeed mamma began to reproach me for what she called my disloyal and treacherous sentiments."
"To single out the Jews as being singularly separate and disloyal from the rest of America is the very soul of anti-Semitism."
"Q If I could follow up on that, doesn't it seem like -- I almost want to use the word disloyal for an official to be told, you can't tell your boss this."