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needless
superfluous
Banning smoking would save needless deaths.
The slaughter of whales is unnecessary and inhuman.

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Open the tool →不必要 (bú bì yào) means “unnecessary, needless, superfluous”.
不必要 is pronounced bú bì yào in Mandarin Chinese.
“unnecessary” is 不必要 (bú bì yào) in Chinese.
This page has 2 example sentences using 不必要, each with pinyin and an English translation.