| abstruse(adjective, extra, advanced) | |
| additional(adjective, extra, advanced) | |
| advanced(adjective, extra) | |
| complex(adjective, extra, advanced) | |
| complicated(adjective, extra, advanced) | |
| compound(adjective, extra, advanced) | |
| difficult(adjective, extra, advanced) | |
| extra(adjective, advanced) | |
| hard(adjective, extra, advanced) | |
| intricate(adjective, extra, advanced) | |
| involved(adjective, extra, advanced) | |
| secondary(adjective, extra, advanced) | |
| subsidiary |
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| APA | Smart Define. (2013). abcs thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/abcs/thesaurus/antonyms |
| Chicago | Smart Define. 2013. "abcs thesaurus" https://smartdefine.org/abcs/thesaurus/antonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2013, abcs thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/abcs/thesaurus/antonyms>. |
| MLA | Smart Define. "abcs thesaurus" 17 June 2013. Web. 24 September 2026. <https://smartdefine.org/abcs/thesaurus/antonyms> |