disloyally
Adverb
Meaning
In a disloyal manner.
Source: Webster's dictionarySynonyms
false
dishonestly
basely
deceitfully
malevolently
underhandedly
adulterously
crookedly
perfidiously
falsely
treacherously
unfairly
maliciously
unscrupulously
delinquently
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Antonyms
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his men acted disloyally and betrayed him in the end