| cheerfully | (adverb) in a cheerful manner | - |
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| fearfully | (adverb) in fear | - |
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| (adverb) in an alarming manner | - |
| fourfold | (adverb) by a factor of four | Synonyms: four times |
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| imperfectly | (adverb) in an imperfect or faulty way | Synonyms: amiss |
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| masterfully | (adverb) in a skillfully masterful manner; with the skill of a master | - |
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| perfectly | (adverb) completely and without qualification; used informally as intensifiers | Synonyms: absolutely, dead, utterly |
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| (adverb) in a perfect or faultless way | - |
| perfidiously | (adverb) in a perfidious manner | - |
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| perforce | (adverb) by necessity; by force of circumstance | - |
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| perfunctorily | (adverb) in a set manner without serious attention; as a formality | Synonyms: pro forma |
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| powerful | (adverb) (Southern regional intensive) very; to a great degree | Synonyms: mightily, mighty, right |
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| powerfully | (adverb) in a manner having a powerful influence | Synonyms: potently |
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| (adverb) in a powerful manner | Synonyms: strongly |
| superficially | (adverb) in a superficial manner | - |
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| superfluously | (adverb) in a superfluous manner | - |
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| tearfully | (adverb) with tears; in a tearful manner | - |
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| underfoot | (adverb) under the feet | - |
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| (adverb) in the way and hindering progress | - |
| wonderfully | (adverb) (used as an intensifier) excellently | Synonyms: marvellously, marvelously, superbly, terrifically, toppingly, wondrous, wondrously |
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