| flabbily | (adverb) in a flabby manner | - |
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| flagrantly | (adverb) in a flagrant manner | - |
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| flamboyantly | (adverb) in a fancy colorful manner | Synonyms: flashily, showily |
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| flashily | (adverb) in a fancy colorful manner | Synonyms: flamboyantly, showily |
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| (adverb) in a meretricious manner | Synonyms: meretriciously |
| flat | (adverb) in a forthright manner; candidly or frankly | Synonyms: directly, straight |
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| (adverb) with flat sails | - |
| flatly | (adverb) in an unqualified manner | Synonyms: categorically, unconditionally |
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| flawlessly | (adverb) smoothly and without difficulty; precisely and deftly | Synonyms: cleanly |
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| fleetly | (adverb) in a swift manner | Synonyms: swiftly |
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| flexibly | (adverb) with flexibility | - |
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| flimsily | (adverb) in a weak and flimsy manner | - |
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| flippantly | (adverb) in a flippant manner | Synonyms: airily |
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| flirtatiously | (adverb) in a flirtatious manner | Synonyms: coquettishly |
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| flop | (adverb) with a flopping sound | - |
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| (adverb) completely | Synonyms: right |
| floridly | (adverb) in a florid manner | - |
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| fluently | (adverb) in a fluent manner | - |
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| flush | (adverb) squarely or solidly | - |
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| (adverb) in the same plane | - |