| unapparent | |
| uncompanionable(adjective, confident, uninformative, unviewable) | |
| uncurious(adjective, bold, uncompanionable, blockaded, cloistered) | |
| under assumed name(expression, adjective, idiom, uncompanionable, openly) | |
| under cover | |
| unforthcoming | |
| ungraspable | |
| uninformative | |
| unobserved | |
| unperceivable | |
| unrecognized | |
| unredeemed | |
| unremarked | |
| unremembered | |
| unrespected(adjective, noted, uncompanionable, blockaded, cloistered) | |
| unrevealed | |
| unseeable | |
| unviewable | |
| winked at | |
| wraithlike |
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| APA | Smart Define. (2016). seen thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/seen/thesaurus/antonyms |
| Chicago | Smart Define. 2016. "seen thesaurus" https://smartdefine.org/seen/thesaurus/antonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2016, seen thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/seen/thesaurus/antonyms>. |
| MLA | Smart Define. "seen thesaurus" 9 February 2016. Web. 22 September 2026. <https://smartdefine.org/seen/thesaurus/antonyms> |