treasonably
Adverb
Meaning
in a disloyal and faithless manner
Source: WordNetSynonyms
false
treacherously
traitorously
faithlessly
treasonously
renegade
dishonestly
apostate
traitorous
deceitfully
disloyally
perfidiously
falsely
treasonous
unscrupulously
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Antonyms
Examples
he behaved treacherously
his wife played him false