| unascertainable | (adjective) not able to be ascertained; resisting discovery | Synonyms: undiscoverable |
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| unascribable | (adjective) not attributable | Synonyms: unattributable |
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| unashamed | (adjective) used of persons or their behavior; feeling no shame | - |
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| unasked | (adjective) uninvited | - |
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| unassailable | (adjective) without flaws or loopholes | Synonyms: bulletproof, ironclad, unshakable, watertight |
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| (adjective) impossible to assail | Synonyms: untouchable |
| (adjective) immune to attack; incapable of being tampered with | Synonyms: impregnable, inviolable, secure, strong, unattackable |
| unassertive | (adjective) inclined to timidity or lack of self-confidence | - |
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| unassignable | (adjective) incapable of being transferred | Synonyms: nontransferable, untransferable |
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| unassigned | (adjective) not assigned | - |
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| unassisted | (adjective) lacking help | - |
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| (adjective) unsupported by other people | Synonyms: single-handed, unbacked |
| unassuming | (adjective) not arrogant or presuming | Synonyms: retiring |
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| unassured | (adjective) lacking boldness or confidence | - |
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| unasterisked | (adjective) not marked with an asterisk | Synonyms: unstarred |
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