| roaring | (adverb) extremely | - |
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| robustly | (adverb) in a robust manner | - |
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| roguishly | (adverb) in a playfully roguish manner | - |
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| (adverb) like a dishonest rogue | - |
| rollickingly | (adverb) in a carefree manner | Synonyms: boisterously |
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| romantically | (adverb) in a manner expressive of love or romance | - |
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| (adverb) in an idealistic and unrealistic manner | - |
| roomily | (adverb) with ample room | Synonyms: spaciously |
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| rotationally | (adverb) in a rotational manner | - |
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| rottenly | (adverb) in a terrible manner | Synonyms: abominably, abysmally, atrociously, awfully, terribly |
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| rotundly | (adverb) in a sonorous manner | Synonyms: sonorously |
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| rough | (adverb) with rough motion as over a rough surface | Synonyms: roughly |
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| (adverb) with roughness or violence (`rough' is an informal variant for `roughly') | Synonyms: roughly |
| roughly | (adverb) (of quantities) imprecise but fairly close to correct | Synonyms: about, approximately, around, close to, just about, more or less, or so, some |
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| (adverb) with rough motion as over a rough surface | Synonyms: rough |
| (adverb) with roughness or violence (`rough' is an informal variant for `roughly') | Synonyms: rough |
| round | (adverb) from beginning to end; throughout | Synonyms: around |
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| roundly | (adverb) in a round manner | - |
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| (adverb) in a blunt direct manner | Synonyms: bluffly, bluntly, brusquely, flat out |
| routinely | (adverb) according to routine or established practice | - |
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| rowdily | (adverb) in a rowdy manner | Synonyms: raucously |
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| royally | (adverb) in a royal manner | Synonyms: like kings, like royalty |
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