Did you know?

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

American pronunciation of 

perfidious

view main entry for perfidious adjective  /pərˈfɪdiəs/
British English pronunciation: perfidious
Click to listen to the pronunciation of perfidious

This is the American English pronunciation of perfidious.

View British English pronunciation of perfidious.

BuzzWord

gaslight

to manipulate someone psychologically so that they begin to question their own perceptions and memories

BuzzWord Article

Open Dictionary

Dunning-Kruger effect

the phenomenon by which an incompetent person is too incompetent to understand his own incompetence

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