| unchained | (adjective) not bound by shackles and chains | Synonyms: unfettered, unshackled, untied |
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| unchallengeable | (adjective) not open to challenge | - |
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| unchallenged | (adjective) generally agreed upon; not subject to dispute | Synonyms: undisputed, unquestioned |
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| unchangeable | (adjective) not changeable or subject to change | - |
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| unchanged | (adjective) not made or become different | - |
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| (adjective) remaining in an original state | Synonyms: unaltered |
| unchanging | (adjective) conforming to the same principles or course of action over time | - |
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| (adjective) showing little if any change | Synonyms: stable, static |
| uncharacteristic | (adjective) distinctive and not typical | - |
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| uncharged | (adjective) of a particle or body or system; having no charge | - |
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| uncharitable | (adjective) lacking love and generosity | - |
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| uncharted | (adjective) (of unknown regions) not yet surveyed or investigated | Synonyms: chartless, unmapped |
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| unchartered | (adjective) not chartered | - |
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| unchaste | (adjective) not chaste | - |
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| uncheckable | (adjective) incapable of being checked or restrained | - |
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| unchecked | (adjective) not restrained or controlled | Synonyms: unbridled, uncurbed, ungoverned |
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| uncheerful | (adjective) causing sad feelings of gloom and inadequacy | Synonyms: cheerless, depressing |
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| unchewable | (adjective) (of meat) full of sinews; especially impossible to chew | Synonyms: fibrous, sinewy, stringy |
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| unchivalrous | (adjective) offensively discourteous | Synonyms: caddish, ungallant |
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| unchristian | (adjective) not of a Christian faith | - |
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| unchristianly | (adjective) not becoming to or like a Christian | Synonyms: unchristlike |
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| unchristlike | (adjective) not becoming to or like a Christian | Synonyms: unchristianly |
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