Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “treacherous”

See all translations

treacherous

adjective uk   /ˈtretʃ.ər.əs/ us    /-ɚ-/

treacherous adjective (DANGEROUS)

If the ground or sea is treacherous, it is extremely dangerous, especially because of bad weather conditions: Snow and ice have left many roads treacherous, and motorists are warned to drive slowly.

treacherous adjective (NOT LOYAL)

A person who is treacherous deceives someone who trusts them, or has no loyalty: Vargas plays the part of a treacherous aristocrat who betrays his king and country. I feel a bit treacherous to my own sex if I ever make general criticisms of women.
(Definition of treacherous from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
What is the pronunciation of treacherous?
Add Cambridge dictionaries to your browser to your website

Definitions of “treacherous” in other dictionaries

Word of the Day

festoon

to decorate a room or other place for a special occasion by hanging coloured paper, lights, or flowers around it, especially in curves

Word of the Day

Party Talk (The language of party chat)

by Kate Woodford,
December 23, 2014
​​​ With the party season in full swing (= at its busiest now), we consider the language of socializing (= enjoying yourself with other people). We’re looking especially at words and phrases which are used to describe the different ways that people behave at a party and the sort of conversations that party

Read More 

tweleb noun

December 22, 2014
informal a Twitter celebrity; (more specifically, someone who has more than 1,000 followers on Twitter) There were a few old and a few new faces, including a tweleb or two. Expect to see and hear more from these cool kids.

Read More