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What is another word for most treacherously?

Need synonyms for most treacherously? Here's a list of similar words from our thesaurus that you can use instead.

Adverb
Superlative for in a false manner
“He treacherously pretended to be my friend while plotting against me behind my back.”
Adverb
Superlative for presenting hidden or unpredictable dangers
“Hiking treacherously through the dense forest, we were constantly wary of the hidden cliffs and unstable terrain.”
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