Did you know?

Click any word in a definition or example to find the entry for that word

treacherous - definition and synonyms

Close

What are red words?

90% of the time, speakers of English use just 7,500 words in speech and writing. These words appear in red, and are graded with stars. One-star words are frequent, two-star words are more frequent, and three-star words are the most frequent.

Close

ThesaurusThesaurus

Thesaurus diagram

The thesaurus of synonyms and related words is fully integrated into the dictionary. Click on the thesaurus category heading under the button in an entry to see the synonyms and related words for that meaning.

more
adjective     treacherous pronunciation in British English
/ˈtretʃərəs/
  1. 1
    someone who is treacherous pretends that they support you but secretly tries to harm you, for example by helping an enemy

    treacherous behaviour/thoughts

  2. 2
    very dangerous, especially because the dangers are not obvious

    Is it wise to go out in this treacherous weather?

    a treacherous road/path/journey

derived word

treacherously

adverb
BuzzWord

crowdbirthing

giving birth to a baby in the presence of a large number of close relatives and/or friends

BuzzWord Article

Open Dictionary

presbyopia

a condition when a person cannot see clearly objects that are close; long sightedness

add a word

Blog

A must for anyone with an interest in the changing face of language. The Macmillan Dictionary blog explores English as it is spoken around the world today.

global English and language change from our blog
Macmillan learn live love play