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Definition maniac in British English

maniac noun

[countable] noun
/ˈmeɪniæk/
1

someone who behaves in a stupid and dangerous way

Example

Slow down! You're driving like a maniac.

Synonyms and related words
2

someone who is considered strange because they have an extremely strong enthusiasm for something

Example

a religious maniac

Synonyms and related words
3

someone who behaves in an extremely excited and confused way because they are mentally ill

Example

a homicidal maniac

Synonyms and related words
Definition maniac in British English