treacherous

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treacherous /ˈtrɛtʃərəs/ adjective
treacherous
/ˈtrɛtʃərəs/
adjective
Learner's definition of TREACHEROUS
[more treacherous; most treacherous]
: not able to be trusted : showing that someone cannot be trusted
: very dangerous and difficult to deal with

— treacherously

adverb
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