| fearfully | (adverb) in fear | - |
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| (adverb) in an alarming manner | - |
| fearlessly | (adverb) without fear | Synonyms: dauntlessly, intrepidly |
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| fearsomely | (adverb) in a fearsome manner | - |
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| feasibly | (adverb) in a practicable manner; so as to be feasible | Synonyms: practicably |
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| fecklessly | (adverb) with ineptitude; in an incompetent manner | Synonyms: ineptly |
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| (adverb) in a feckless manner; irresponsibly and incompetently | - |
| federally | (adverb) by federal government | - |
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| feebly | (adverb) in a halting and feeble manner | - |
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| (adverb) in a faint and feeble manner | - |
| feelingly | (adverb) with great feeling | - |
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| feetfirst | (adverb) with the feet foremost | - |
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| felicitously | (adverb) in a felicitous manner | - |
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| ferociously | (adverb) in a physically fierce manner | Synonyms: fiercely |
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| fervently | (adverb) with passionate fervor | Synonyms: fervidly, fierily |
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| fervidly | (adverb) with passionate fervor | Synonyms: fervently, fierily |
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| feudally | (adverb) in a feudal manner | - |
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| feverishly | (adverb) in a feverish manner | - |
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