adjective
EXAMPLES FROM CORPUS
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He might be seen returning, and it was needful he should come by the way he would have taken to Longner.
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It was not spoken of but drawn upon when it was needful .
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It will be needful to find them, Master Hussey.
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The proposed discount will go only a certain way towards doing what is needful .
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To effect the separation it was needful that the particle size was more or less the same.