adjective
showing caution or restraint; not using or giving freely
adverb
in a way that shows caution or restraint; without wastefulness
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The government is sparing no effort in ensuring the safety of its citizens.
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She is known for sparing no expense when it comes to her wardrobe.
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I'm sparing no time in getting this project done.
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His sparing use of words made his speech all the more impactful.