| undo | (verb) cancel, annul, or reverse an action or its effect | - |
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| (verb) cause to become loose | Synonyms: loosen, untie |
| (verb) remove the outer cover or wrapping of | Synonyms: unwrap |
| (verb) deprive of certain characteristics | Synonyms: unmake |
| (verb) cause the ruin or downfall of | - |
| undoable | (adjective) impossible to achieve | Synonyms: unachievable, unattainable, unrealizable |
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| undock | (verb) take (a ship) out of a dock | - |
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| (verb) move out of a dock | - |
| undocumented | (adjective) lacking necessary documents (as for e.g. permission to live or work in a country) | - |
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| undoer | (noun) a person who destroys or ruins or lays waste to | Synonyms: destroyer, ruiner, uprooter, waster |
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| (noun) a person who unfastens or unwraps or opens | Synonyms: opener, unfastener, untier |
| (noun) a seducer who ruins a woman | - |
| 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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| undoing | (noun) an act that makes a previous act of no effect (as if not done) | - |
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| (noun) loosening the ties that fasten something | Synonyms: unfastening, untying |
| 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 |
| undoubtedly | (adverb) without doubt; certainly | Synonyms: doubtless, doubtlessly |
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