treacherous
[adjective]
Synonyms:
- disloyal, deceitful, double-dealing, duplicitous, faithless, false, perfidious, traitorous, unfaithful, untrustworthy
- dangerous, deceptive, hazardous, icy, perilous, precarious, risky, slippery, unreliable, unsafe, unstable

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Antonyms: dependable, trustworthy
Related Words: undependable, unreliable, untrustworthy, betraying, deceptive, double-crossing, falsehearted, misleading, Punic, ticklish, tricky, precarious

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English Thesaurus: dangerous, risky, hazardous, unsafe, treacherous, ...

[TahlilGaran] English Synonym Dictionary ▲

treach‧e‧rous /ˈtretʃərəs/ adjective

1. someone who is treacherous cannot be trusted because they are not loyal and secretly intend to harm you:
a sly and treacherous woman
a treacherous plot to overthrow the leader

2. ground, roads, weather conditions etc that are treacherous are particularly dangerous because you cannot see the dangers very easily:
treacherous mountain roads
Strong winds and loose rocks made climbing treacherous.
—treacherously adverb

[TahlilGaran] Dictionary of Contemporary English ▲

treacherous
adj.
VERBS be, look, prove | become | remain
ADV. extremely, very | rather | notoriously the mountain's notoriously treacherous rocky crest

[TahlilGaran] Collocations Dictionary ▲

dangerous likely to cause death or serious harm, or cause something bad to happen:
Snow and ice are making driving conditions very dangerous.
dangerous drugs
a dangerous criminal
risky if something is risky, something bad could easily happen or you could easily make a mistake:
Doctors said it was too risky to operate.
a risky situation
hazardous /ˈhæzədəs $ -zər-/ especially written dangerous – used especially about substances, jobs, and journeys:
hazardous waste
hazardous chemicals
hazardous occupations
The expedition was extremely hazardous.
unsafe dangerous because someone is very likely to be hurt – used especially about places or conditions:
The roads are unsafe for cyclists.
unsafe working conditions
treacherous /ˈtretʃərəs/ formal literary places or conditions that are treacherous are very dangerous for anyone who is walking, driving, climbing etc in them:
The snow turned to ice, making conditions treacherous for walkers.
the island’s treacherous coastline
With no lighting, the roads can be treacherous.
perilous /ˈperələs, ˈperɪləs/ literary a perilous journey, situation etc is very dangerous:
a perilous journey across the sea
high-risk [only before noun] a high-risk job, situation, or behaviour is likely to be dangerous:
Drug users need to know that sharing needles is high-risk behaviour.

[TahlilGaran] English Thesaurus ▲