Liberal Dictionary English Dictionary
adjective
- false to one’s obligations or allegiances; not loyal; faithless; treacherous.
adjective
- not loyal or faithful; deserting one’s allegiance or duty
early 15c. (implied in disloyally), from Old French desloial, desleal (Modern French déloyal) “treacherous, false, deceitful,” from des- (see dis-) + loial (see loyal).