| flub | (verb) make a mess of, destroy or ruin | Synonyms: ball up, blow, bobble, bodge, bollix, bollix up, bollocks, bollocks up, botch, botch up, bumble, bungle, fluff, foul up, fuck up, fumble, louse up, mess up, mishandle, muck up, muff, screw up, spoil |
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| fluctuate | (verb) be unstable | - |
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| (verb) move or sway in a rising and falling or wavelike pattern | Synonyms: vacillate, waver |
| (verb) cause to fluctuate or move in a wavelike pattern | - |
| fluff | (verb) ruffle (one's hair) by combing the ends towards the scalp, for a full effect | Synonyms: tease |
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| (verb) erect or fluff up | Synonyms: ruffle |
| (verb) make a mess of, destroy or ruin | Synonyms: ball up, blow, bobble, bodge, bollix, bollix up, bollocks, bollocks up, botch, botch up, bumble, bungle, flub, foul up, fuck up, fumble, louse up, mess up, mishandle, muck up, muff, screw up, spoil |
| flummox | (verb) be a mystery or bewildering to | Synonyms: amaze, baffle, beat, bewilder, dumbfound, get, gravel, mystify, nonplus, perplex, pose, puzzle, stick, stupefy, vex |
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| flump | (verb) set (something or oneself) down with or as if with a noise | Synonyms: plank, plonk, plop, plump, plump down, plunk, plunk down |
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| (verb) fall heavily | Synonyms: flump down |
| flunk | (verb) fail to get a passing grade | Synonyms: bomb, fail, flush it |
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| fluoresce | (verb) exhibit or undergo fluorescence | - |
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| fluoridate | (verb) subject to fluoridation; treat with fluoride | Synonyms: fluoridise, fluoridize |
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| fluoridise | (verb) subject to fluoridation; treat with fluoride | Synonyms: fluoridate, fluoridize |
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| fluoridize | (verb) subject to fluoridation; treat with fluoride | Synonyms: fluoridate, fluoridise |
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| flurry | (verb) cause to feel embarrassment | Synonyms: confuse, disconcert, put off |
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| (verb) move in an agitated or confused manner | - |
| flush | (verb) turn red, as if in embarrassment or shame | Synonyms: blush, crimson, redden |
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| (verb) cause to flow through something | - |
| (verb) rinse, clean, or empty with a liquid | Synonyms: purge, scour |
| (verb) irrigate with water from a sluice | Synonyms: sluice |
| (verb) cause to flow or flood with or as if with water | - |
| (verb) make level or straight | Synonyms: even, even out, level |
| (verb) glow or cause to glow with warm color or light | - |
| fluster | (verb) cause to be nervous or upset | - |
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| (verb) be flustered; behave in a confused manner | - |
| flute | (verb) form flutes in | - |
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| flutter | (verb) wink briefly | Synonyms: bat |
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| (verb) beat rapidly | Synonyms: palpitate |
| (verb) move back and forth very rapidly | Synonyms: flicker, flitter, quiver, waver |
| (verb) move along rapidly and lightly; skim or dart | Synonyms: dart, fleet, flit |
| (verb) flap the wings rapidly or fly with flapping movements | - |
| flux | (verb) mix together different elements | Synonyms: blend, coalesce, combine, commingle, conflate, fuse, immix, meld, merge, mix |
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| (verb) become liquid or fluid when heated | Synonyms: liquefy, liquify |
| (verb) move or progress freely as if in a stream | Synonyms: flow |