Longman Dictionary of Contemporary English homepage

treacherous

adjective
     
treach‧e‧rous
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
WORD FOCUS: dangerous WORD FOCUS: dangerous
similar words: hazardous, risky, treacherous, perilous literary


See also
dangerous

Dictionary pictures of the day
Do you know what each of these is called?
What is the word for picture 1? What is the word for picture 2? What is the word for picture 3? What is the word for picture 4?
Click on any of the pictures above to find out what it is called.

Explore our topic dictionary