| ununderstood | (adjective) not understood | - |
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| unusable | (adjective) not capable of being used | Synonyms: unserviceable, unuseable |
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| unuseable | (adjective) not capable of being used | Synonyms: unserviceable, unusable |
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| unused | (adjective) not yet used or soiled | Synonyms: fresh |
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| (adjective) not in active use | Synonyms: idle |
| (adjective) not yet put into use | - |
| unusual | (adjective) not usual or common or ordinary | - |
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| (adjective) being definitely out of the ordinary and unexpected; slightly odd or even a bit weird | Synonyms: strange |
| (adjective) not commonly encountered | - |
| unutterable | (adjective) defying expression or description | Synonyms: indefinable, indescribable, ineffable, unspeakable, untellable |
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| (adjective) too sacred to be uttered | Synonyms: ineffable, unnameable, unspeakable |
| (adjective) very difficult to pronounce correctly | Synonyms: unpronounceable |
| unuttered | (adjective) not made explicit | Synonyms: unexpressed, unsaid, unspoken, unstated, unverbalised, unverbalized, unvoiced |
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