false to one's obligations or allegiances; not loyal; faithless; treacherous.

Origin of disloyal

1470–80; < Middle French desloial, Old French desleal, equivalent to des- dis-1 + leal loyal
Related formsdis·loy·al·ist, noundis·loy·al·ly, adverb

Synonyms for disloyal

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for disloyal

Contemporary Examples of disloyal

Historical Examples of disloyal

  • Mississippi was disloyal, and didn't deserve to have any representative.

  • You will perceive that I am disloyal to a member of my Council so that I may be loyal to my country.

    The Snare

    Rafael Sabatini

  • This was considered a sort of disloyal falling away from the ruling feeling.


    Joseph Conrad

  • It would have been disloyal, an admission that all was over, the beginning of the end.


    Joseph Conrad and F.M. Hueffer

  • "I demand an explanation of your disloyal conduct," said Angela proudly.

British Dictionary definitions for disloyal



not loyal or faithful; deserting one's allegiance or duty
Derived Formsdisloyally, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for disloyal

early 15c. (implied in disloyally), from Old French desloial, desleal (Modern French déloyal) "treacherous, false, deceitful," from des- (see dis-) + loial (see loyal).

Online Etymology Dictionary, © 2010 Douglas Harper