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English definition of “unnecessary”

unnecessary

adjective  /ʌnˈnes·əˌseər·i/ us  
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  /ʌnˌnes·əˈser·ə·li/ us  
I thought his explanation was unnecessarily complex.
(Definition of unnecessary from the Cambridge Academic Content Dictionary © Cambridge University Press)
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