/ˈtretʃərəs/
treach·er·ous
BrE /ˈtretʃərəs/
NAmE /ˈtretʃərəs/
that cannot be trusted; intending to harm you
SYN deceitful
He was weak, cowardly and treacherous.
lying, treacherous words
dangerous, especially when seeming safe
The ice on the roads made driving conditions treacherous.
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treach·er·ous·ly
BrE /ˈtretʃərəsli/
NAmE /ˈtretʃərəsli/