| fractiously | (adverb) in a fractious manner | - |
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| (adverb) in a peevish manner | Synonyms: peevishly, querulously |
| frankly | (adverb) (used as intensives reflecting the speaker's attitude) it is sincerely the case that | Synonyms: candidly, honestly |
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| frantically | (adverb) in an ungovernable manner | Synonyms: madly |
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| fraternally | (adverb) in a brotherly manner | - |
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| fraudulently | (adverb) in a dishonest and fraudulent manner | - |
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| freakishly | (adverb) unpredictably | Synonyms: capriciously |
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| free | (adverb) without restraint | Synonyms: loose |
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| freely | (adverb) in a free manner | - |
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| frenetically | (adverb) in a very agitated manner; as if possessed by an evil spirit | Synonyms: demoniacally |
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| frenziedly | (adverb) in a frenzied manner | Synonyms: hectically |
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| frequently | (adverb) many times at short intervals | Synonyms: oft, often, oftentimes, ofttimes |
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| fresh | (adverb) very recently | Synonyms: freshly, new, newly |
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| freshly | (adverb) very recently | Synonyms: fresh, new, newly |
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| (adverb) in an impudent or impertinent manner | Synonyms: impertinently, impudently, pertly, saucily |
| fretfully | (adverb) in a fretful manner | - |
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| frighteningly | (adverb) in a terrifying manner | Synonyms: scarily |
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| frightfully | (adverb) used as intensifiers | Synonyms: awful, awfully, terribly |
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| frigidly | (adverb) without warmth or enthusiasm | Synonyms: frostily |
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| friskily | (adverb) in a playfully frisky manner | - |
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| frivolously | (adverb) in a frivolous manner | - |
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| frontally | (adverb) in, at, or toward the front | - |
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| frontward | (adverb) at or to or toward the front; forward | Synonyms: forrad, forrard, forward, forwards, frontwards |
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| frontwards | (adverb) at or to or toward the front; forward | Synonyms: forrad, forrard, forward, forwards, frontward |
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| frostily | (adverb) without warmth or enthusiasm | Synonyms: frigidly |
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| frothily | (adverb) in a frothy manner | - |
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| frowningly | (adverb) with a frown; while frowning | - |
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| frugally | (adverb) in a frugal manner | - |
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| fruitfully | (adverb) in a productive way | Synonyms: productively, profitably |
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| fruitlessly | (adverb) in an unproductive manner | Synonyms: unproductively, unprofitably |
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| frumpily | (adverb) in a dowdy unfashionable manner | Synonyms: dowdily, frumpishly |
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| frumpishly | (adverb) in a dowdy unfashionable manner | Synonyms: dowdily, frumpily |
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