adj.
Pronunciation: ' tre-ch ə -r ə s, ' trech-r ə s
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