| unrestrained | (adjective) not subject to restraint | - |
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| (adjective) marked by uncontrolled excitement or emotion | Synonyms: delirious, excited, frantic, mad |
| unstrained | (adjective) not resulting from undue effort; not forced | Synonyms: unforced |
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| (adjective) not placed under psychological stress | - |
| unstratified | (adjective) not deposited in layers | - |
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| untraceable | (adjective) incapable of being traced or tracked down | - |
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| untracked | (adjective) lacking pathways | Synonyms: pathless, roadless, trackless, untrod, untrodden |
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| untraditional | (adjective) not conforming to or in accord with tradition | Synonyms: nontraditional |
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| untrained | (adjective) not disciplined or conditioned or made adept by training | - |
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| untrammeled | (adjective) not confined or limited | Synonyms: untrammelled |
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| untrammelled | (adjective) not confined or limited | Synonyms: untrammeled |
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| untransferable | (adjective) incapable of being transferred | Synonyms: nontransferable, unassignable |
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| untranslatable | (adjective) not capable of being put into another form or style or language | - |
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| untransmutable | (adjective) not capable of being changed into something else | Synonyms: inconvertible |
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| untraveled | (adjective) not traveled over or through | Synonyms: untravelled |
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| (adjective) not having traveled much, especially to foreign lands; not having gained experience by travel | Synonyms: untravelled |
| untravelled | (adjective) not traveled over or through | Synonyms: untraveled |
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| (adjective) not having traveled much, especially to foreign lands; not having gained experience by travel | Synonyms: untraveled |
| untraversable | (adjective) incapable of being traversed | - |
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| untraversed | (adjective) not traveled over or through | - |
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| ventral | (adjective) toward or on or near the belly (front of a primate or lower surface of a lower animal) | - |
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| (adjective) nearest to or facing toward the axis of an organ or organism | Synonyms: adaxial |