| foodless | (adjective) being without food | - |
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| foolhardy | (adjective) marked by defiant disregard for danger or consequences | Synonyms: heady, rash, reckless |
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| fooling | (adjective) characterized by a feeling of irresponsibility | Synonyms: casual |
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| foolish | (adjective) devoid of good sense or judgment | - |
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| (adjective) having or revealing stupidity | Synonyms: anserine, dopey, dopy, gooselike, goosey, goosy, jerky |
| foolproof | (adjective) not liable to failure | Synonyms: unfailing |
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| footed | (adjective) having feet | - |
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| footless | (adjective) having no feet or analogous appendages | - |
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| footling | (adjective) (informal) small and of little importance | Synonyms: fiddling, lilliputian, little, niggling, petty, picayune, piddling, piffling, trivial |
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| footloose | (adjective) free to go or do as one pleases | - |
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| footsore | (adjective) having sore or tired feet | - |
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| footsure | (adjective) not liable to stumble or fall | Synonyms: sure-footed, surefooted |
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