verb
Present participle of the verb 'lack', indicating an absence or deficiency of something.
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The research paper was lacking in sufficient evidence to support its claims.
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The party was fun, but the music was lacking a bit of energy.
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The new video game is cool, but it's lacking that extra oomph to make it really addictive.
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Her artwork was beautiful, but it felt like it was lacking a piece of her soul.