treacherous
adjective
[ ˈtrɛtʃ(ə)rəs ]
• guilty of or involving betrayal or deception.
• "a treacherous Gestapo agent"
Similar:
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,
two-timing,
Punic,
• (of ground, water, conditions, etc.) presenting hidden or unpredictable dangers.
• "a holidaymaker was swept away by treacherous currents"
Similar:
dangerous,
hazardous,
perilous,
unsafe,
precarious,
risky,
deceptive,
unreliable,
undependable,
unstable,
icy,
ice-covered,
slippery,
glassy,
dicey,
hairy,
slippy,
gnarly,
Origin:
Middle English (in treacherous (sense 1 of the adjective)): from Old French trecherous, from trecheor ‘a cheat’, from trechier ‘to cheat’.
