treacherous
/ˈtɹɛt͡ʃəɹəs/ adjective
- adjective Exhibiting treachery.
- adjective Deceitful; inclined to betray.
- adjective Unreliable; dangerous. “a treacherous mountain trail”
Synonyms
Judaslike perfidious traitorous beguiling deceitful deceptious deceptive deceptory fallacious fraudful fraudulent mendacious hazardous perilous unsound dangerous dangersome hot jeopardous wicked unreliable punic
Antonyms
loyal faithful fidelitous leal steadfast true untraitorous untreacherous
Etymology
From Old French trecheros, tricheros (“deceitful”), equivalent to treacher + -ous. See treacher.
Webster’s 1913
- adjective Like a traitor; involving treachery; violating allegiance or faith pledged; traitorous to the state or sovereign; perfidious in private life; betraying a trust; faithless.
Etymology [See Treacher.]
Sources: Wiktionary · WordNet 3.0 · Webster’s 1913 — from the Wiktionary entry “treacherous”, CC BY-SA 4.0. Details