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treacherous

treach·er·ous [ tréchərəss ]


adjective 
Definition:
 
1. traitorous: betraying or ready to betray somebody's trust, confidence, or faith

2. perilous: involving hidden dangers or hazards
treacherous seas

[14th century. < Old French trecheros "deceitfulness" < trechier "cheat, trick"]

treach·er·ous·ly adverb
treach·er·ous·ness noun
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