traitorously vs treacherously

traitorously and treacherously both are adverbs.

Word	Noun	Adjective	Verb	Adverb
traitorously	No	No	No	Yes
treacherously	No	No	No	Yes

As adverbs, traitorously and treacherously are synonyms defined as:

Other synonyms of traitorously include faithlessly, false, treasonably.

traitorously (adverb)	treacherously (adverb)
in a disloyal and faithless manner	in a disloyal and faithless manner