| double | (adverb) to double the degree | Synonyms: doubly, twice |
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| (adverb) two together | - |
| (adverb) downward and forward | - |
| doubly | (adverb) to double the degree | Synonyms: double, twice |
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| (adverb) in a twofold manner | Synonyms: in two ways |
| doubtfully | (adverb) in a doubtful manner | Synonyms: dubiously |
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| doubtless | (adverb) without doubt; certainly | Synonyms: doubtlessly, undoubtedly |
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| doubtlessly | (adverb) without doubt; certainly | Synonyms: doubtless, undoubtedly |
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| dourly | (adverb) in a sullen manner | Synonyms: glumly, sullenly |
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| hazardously | (adverb) in a dangerous manner | Synonyms: dangerously, perilously |
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| stupendously | (adverb) to a stupendous degree | - |
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| tremendously | (adverb) vastly | Synonyms: enormously, hugely, staggeringly |
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| undoubtedly | (adverb) without doubt; certainly | Synonyms: doubtless, doubtlessly |
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