| on | |
| onwards | |
| out | |
| outdated(adjective, dull) | |
| outmoded | |
| outwards | |
| removed | |
| slow(adjective, dull) | |
| styleless | |
| unacquainted | |
| unacquainted with | |
| unaware | |
| unconscious | |
| unknowing | |
| unmindful | |
| unpopular(adjective, dull) | |
| unwitting | |
| worn(adjective, dull) | |
| afield | |
| ahead |
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| APA | Smart Define. (2015). hip thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/hip/thesaurus/antonyms |
| Chicago | Smart Define. 2015. "hip thesaurus" https://smartdefine.org/hip/thesaurus/antonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2015, hip thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/hip/thesaurus/antonyms>. |
| MLA | Smart Define. "hip thesaurus" 10 April 2015. Web. 23 September 2026. <https://smartdefine.org/hip/thesaurus/antonyms> |