Synonyms of treacherous in English:

treacherous


See US English definition of treacherous

See UK English definition of treacherous

See Spanish definition of traicionero

adjective

1‘two treacherous Scottish lords betrayed Wallace's whereabouts’

SYNONYMS
traitorous, disloyal, perfidious, faithless, unfaithful, duplicitous, false-hearted, deceitful, false, untrue, back-stabbing, double-crossing, double-dealing, two-faced, Janus-faced, untrustworthy, unreliable, undependable, fickle
apostate, renegade, subversive, seditious, rebellious, mutinous, breakaway
treasonable, treasonous
informal two-timing
rare Punic
ANTONYMS

loyal, faithful

2‘treacherous driving conditions’

SYNONYMS
dangerous, hazardous, perilous, unsafe, precarious, risky, deceptive, unreliable, undependable, unstable
icy, ice-covered, slippery, glassy
informal dicey, hairy, slippy
North American informal gnarly
ANTONYMS

safe, reliable