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この作業は不必要だ。
This work is unnecessary.
Not needed; unnecessary; something that is not required.
この書類は不必要です。
This document is unnecessary.
不必要なストレスを減らす。
To reduce unnecessary stress.
Often used to describe things that are redundant or not essential.
Often used to politely decline or point out redundancy.
Combination of 不 (fu, 'not') and 必要 (hitsuyou, 'necessary').
Commonly used in both formal and informal contexts to indicate that something is not needed.