Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “maniac”

maniac

noun [C] uk   /ˈmeɪ.ni.æk/ us  

maniac noun [C] (INTERESTED)

informal a person who has a very strong interest in a particular activity: a football/sex maniacEnthusiastsAdmirers

maniac noun [C] (MENTALLY ILL)

a person who behaves in an uncontrolled way, not worrying about risks or danger: Some maniac was running down the street waving a massive metal bar.informal I won't get in the car with Richard - he drives like a maniac!Of unsound mindStupid and silly
(Definition of maniac from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
What is the pronunciation of maniac?
Browse related topics

You are looking at an entry to do with Of unsound mind, but you might be interested in these topics from the Psychology, psychiatry, & psychoanalysis topic area:

Add Cambridge dictionaries to your browser to your website

Definitions of “maniac” in other dictionaries

Word of the Day

stampede

When animals or people stampede, they all move quickly in the same direction, often because they are frightened.

Word of the Day

Blog

Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More