treacherously vs traitorously

treacherously and traitorously both are adverbs.

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

As adverbs, treacherously and traitorously are synonyms defined as:

Other synonyms of treacherously include faithlessly, false, treasonably.

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