C2adjectivetransporttravel
US/ˈtretʃ.ər.əs/
UK/ˈtretʃ.ər.əs/
very dangerous, especially because of bad weather or hidden risks; also not loyal
In context
The mountain pass becomes treacherous when it rains and rocks fall onto the road.
Strong currents make this part of the coast treacherous for swimmers.
He was betrayed by a treacherous business partner.
Words that go with treacherous
adjective + noun
- treacherous conditionsFog and ice created treacherous conditions on the highway.
- treacherous roadsDrivers were warned about treacherous roads after the storm.
- treacherous watersOnly experienced sailors cross these treacherous waters.
- treacherous journeyMigrants made a treacherous journey across the desert.
adverb + adjective
- particularly treacherousThe last section of the trail is particularly treacherous.