| flickering | (adjective) shining unsteadily | Synonyms: aflicker |
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| flighted | (adjective) having feathers | - |
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| flightless | (adjective) incapable of flying | - |
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| flighty | (adjective) unpredictably excitable (especially of horses) | Synonyms: nervous, skittish, spooky |
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| (adjective) guided by whim and fancy | Synonyms: flyaway, head-in-the-clouds, scatterbrained |
| flimsy | (adjective) not convincing | Synonyms: unconvincing |
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| (adjective) lacking solidity or strength | Synonyms: insubstantial |
| (adjective) lacking substance or significance | Synonyms: fragile, slight, tenuous, thin |
| flint | (adjective) showing unfeeling resistance to tender feelings | Synonyms: flinty, granitic, obdurate, stony |
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| flinty | (adjective) containing flint | - |
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| (adjective) showing unfeeling resistance to tender feelings | Synonyms: flint, granitic, obdurate, stony |
| flip | (adjective) marked by casual disrespect | Synonyms: impudent, insolent, snotty-nosed |
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| flippant | (adjective) showing inappropriate levity | Synonyms: light-minded |
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| flirtatious | (adjective) like a coquette | Synonyms: coquettish |
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