| undoable | (adjective) impossible to achieve | Synonyms: unachievable, unattainable, unrealizable |
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| undocumented | (adjective) lacking necessary documents (as for e.g. permission to live or work in a country) | - |
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| undogmatic | (adjective) unwilling to accept authority or dogma (especially in religion) | Synonyms: free-thinking, latitudinarian, undogmatical |
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| undogmatical | (adjective) unwilling to accept authority or dogma (especially in religion) | Synonyms: free-thinking, latitudinarian, undogmatic |
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| undomestic | (adjective) not domestic or related to home | - |
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| undomesticated | (adjective) unaccustomed to home life | - |
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| (adjective) not domesticated | - |
| undone | (adjective) thrown into a state of disorganization or incoherence | Synonyms: unstuck |
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| (adjective) not fastened or tied or secured | - |
| (adjective) not done | - |
| (adjective) doomed to extinction | Synonyms: done for, ruined, sunk, washed-up |