| fluctuating | (adjective) having unpredictable ups and downs | - |
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| fluent | (adjective) expressing yourself readily, clearly, effectively | Synonyms: eloquent, facile, silver-tongued, silver, smooth-spoken |
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| (adjective) smooth and unconstrained in movement | Synonyms: fluid, liquid, smooth |
| fluffy | (adjective) like down or as soft as down | Synonyms: downlike, downy, flossy |
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| fluid | (adjective) subject to change; variable | Synonyms: unstable |
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| (adjective) in cash or easily convertible to cash | Synonyms: liquid |
| (adjective) smooth and unconstrained in movement | Synonyms: fluent, liquid, smooth |
| (adjective) characteristic of a fluid; capable of flowing and easily changing shape | Synonyms: runny |
| (adjective) affording change (especially in social status) | Synonyms: mobile |
| flukey | (adjective) subject to accident or chance or change | Synonyms: chancy, fluky, iffy |
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| fluky | (adjective) subject to accident or chance or change | Synonyms: chancy, flukey, iffy |
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| fluorescent | (adjective) brilliantly colored and apparently giving off light | - |
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| (adjective) emitting light during exposure to radiation from an external source | - |
| flush | (adjective) of a surface exactly even with an adjoining one, forming the same plane | - |
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| (adjective) having an abundant supply of money or possessions of value | Synonyms: affluent, loaded, moneyed, substantial, wealthy |
| flushed | (adjective) (especially of the face) reddened or suffused with or as if with blood from emotion or exertion | Synonyms: crimson, red-faced, red, reddened |
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| (adjective) having the pinkish flush of health | Synonyms: rose-cheeked, rosy-cheeked, rosy |
| flustered | (adjective) thrown into a state of agitated confusion; (`rattled' is an informal term) | Synonyms: hot and bothered, perturbed, rattled |
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| fluvial | (adjective) of or relating to or happening in a river | - |
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