Definition of “unnecessary” - English Dictionary

“unnecessary” in British English

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unnecessaryadjective

uk /ʌnˈnes.ə.ser.i/ us /ʌnˈnes.ə.ser.i/

B1 not needed or wanted, or more than is needed or wanted:

I thought a lot of the violence in the movie was totally unnecessary.
The idea is to kill the animal as quickly as possible without causing unnecessary suffering.

An offensive remark or action that is unnecessary could have been avoided:

He just humiliated her in front of everyone - it was so unnecessary.

More examples

unnecessarily
adverb uk /ʌnˈnes.ə.sər.əl.i/ /ʌnˌnes.əˈser.əl.i/ us /ʌnˌnes.əˈser.əl.i. ʌnˈnes.ə.ser.əl.i/

C1

We don't want to alarm people unnecessarily, but they should be aware of potential dangers.

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

“unnecessary” in American English

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unnecessaryadjective

us /ʌnˈnes·əˌseər·i/

not needed or wanted, or more than is needed or wanted:

unnecessary expenses
The key to successful investing is to avoid taking unnecessary risks.
unnecessarily
adverb us /ʌnˌnes·əˈser·ə·li/

I thought his explanation was unnecessarily complex.

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