Main Entry: treach·er·ous

Pronunciation: \ˈtre-chə-rəs, ˈtrech-rəs\

Function: adjective

Date: 14th century

1 : characterized by or manifesting treachery : perfidious
2 a : likely to betray trust : unreliable <a treacherous memory> b : providing insecure footing or support <treacherous quicksand> c : marked by hidden dangers, hazards, or perils

synonyms see faithless

— treach·er·ous·ly adverb

— treach·er·ous·ness noun