| unexchangeability | (noun) the quality of being incapable of exchange or interchange | - |
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| unexchangeable | (adjective) not suitable to be exchanged | - |
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| (adjective) used especially of currencies; incapable of being exchanged for or replaced by another currency of equal value | Synonyms: inconvertible, unconvertible |
| unhand | (verb) remove the hand from | - |
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| unmechanical | (adjective) (of a person) lacking mechanical skills | Synonyms: nonmechanical |
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| unmechanised | (adjective) not mechanized | Synonyms: unmechanized |
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| unmechanized | (adjective) not mechanized | Synonyms: unmechanised |
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| unmerchantable | (adjective) not fit for sale | Synonyms: unmarketable, unvendible |
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| unthankful | (adjective) not feeling or showing gratitude | Synonyms: thankless, ungrateful |
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| urethane | (noun) an ester of carbamic acid | - |
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| whang | (noun) the act of hitting vigorously | Synonyms: belt, knock, rap, whack |
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| (verb) attack forcefully | - |
| (verb) propel or hit with force | - |
| (verb) beat with force | - |
| yataghan | (noun) a long Turkish knife with a curved blade having a single edge | - |
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