| http://www.w3.org/ns/prov#value | - treacherous adjective treach???e???rous1 someone who is treacherous cannot be trusted because they are not loyal and secretly intend to harm you: a sly and treacherous woman a treacherous plot to overthrow the leader2 ground, roads, weather conditions etc that are treacherous are particularly dangerous because you cannot see the dangers very easily: treacherous mountain roads Strong winds and loos
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