Longman Dictionary of Contemporary English homepage

unnecessary

 adjective
     
un‧ne‧ces‧sa‧ry
not needed or more than is needed
There's no point in taking unnecessary risks.
We can't afford any unnecessary delays.
Williams was found guilty of causing unnecessary suffering to animals
—unnecessarily adverb:
I don't want to worry you unnecessarily.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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