| unfueled | (adjective) not provided with fuel | - |
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| unfulfilled | (adjective) of persons; marked by failure to realize full potentialities | Synonyms: unrealised, unrealized |
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| unfunctional | (adjective) not related to or suitable for everyday needs or activities | - |
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| unfunded | (adjective) not furnished with funds | - |
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| unfunny | (adjective) not funny; especially failing to achieve the intended humor | - |
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| unfurnished | (adjective) not equipped with what is needed especially furniture | - |
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| unfurrowed | (adjective) not marked with shallow depressions or furrows | - |
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