| unprecedentedly | (adverb) in an unprecedented manner | - |
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| unpredictably | (adverb) in an erratic unpredictable manner | Synonyms: erratically |
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| unpretentiously | (adverb) in an unpretentious manner | - |
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| unproductively | (adverb) in an unproductive manner | Synonyms: fruitlessly, unprofitably |
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| unprofitably | (adverb) in an unproductive manner | Synonyms: fruitlessly, unproductively |
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| (adverb) without gain or profit | Synonyms: gainlessly, profitlessly |
| unpropitiously | (adverb) in an inauspicious manner | Synonyms: inauspiciously |
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