Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “lunatic”

See all translations

lunatic

noun [C] uk   /ˈluː.nə.tɪk/ us    /-t̬ɪk/
someone who behaves in a silly or dangerous way: He drives like a lunatic. offensive old-fashioned a person who is mentally ill

lunatic

adjective uk   /ˈluː.nə.tɪk/ us    /-t̬ɪk/
silly in a dangerous way
Translations of “lunatic”
in Korean 미치광이…
in Arabic مَجْنون…
in Portuguese louco, -a, demente…
in Catalan boig, boja…
in Japanese 狂人…
in Italian folle, pazzo, -a…
in Chinese (Traditional) 瘋子,癲狂的人, 精神病人…
in Russian сумасшедший…
in Turkish deli, kaçık, fıttırık…
in Chinese (Simplified) 疯子,癫狂的人, 精神病人…
in Polish wariat/ka…
(Definition of lunatic from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
What is the pronunciation of lunatic?
Add Cambridge dictionaries to your browser to your website

Definitions of “lunatic” in other dictionaries

Word of the Day

lamb

a young sheep, or the flesh of a young sheep eaten as meat

Word of the Day

The way we move (Verbs for walking and running)

by Kate Woodford,
March 25, 2015
​​​ This week we’re looking at interesting ways to describe the way that people move. Most of the verbs that we’ll be considering describe how fast or slow people move. Others describe the attitude or state of mind of the person walking or running. Some describe both. Starting with verbs for walking slowly,

Read More 

crossfit noun

March 23, 2015
high-intensity strength training Two women in strappy dresses discussed how much weight they could snatch

Read More