Meaning of “vicious” in the English Dictionary

"vicious" in British English

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viciousadjective

uk /ˈvɪʃ.əs/ us /ˈvɪʃ.əs/

C2 Viscious people or actions show an intention or wish to hurt someone or something very badly:

a vicious thug
a vicious dog
The police said that this was one of the most vicious attacks they'd ever seen.
He gave her a vicious look.

C2 used to describe an object, condition, or remark that causes great physical or emotional pain:

a vicious lie/accusation/rumour
I have a vicious headache.

More examples

viciously
adverb uk /ˈvɪʃ.əs.li/ us /ˈvɪʃ.əs.li/
viciousness
noun [ U ] uk /ˈvɪʃ.əs.nəs/ us /ˈvɪʃ.əs.nəs/

(Definition of “vicious” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"vicious" in American English

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viciousadjective

us /ˈvɪʃ·əs/

(of an act) intending to hurt badly, or (of a person or animal) likely to be violent:

I don’t believe he is a vicious dog.
The few who disagreed became the targets of vicious written attacks on the Internet.

(Definition of “vicious” from the Cambridge Academic Content Dictionary © Cambridge University Press)