| rock-bottom(noun, foundation, ground, bottom) | |
| basement(noun, foundation, ground, bottom) | |
| bedrock(noun, foundation, ground, bottom) | |
| bottommost(noun, foundation, ground, bottom) | |
| lowermost(noun, foundation, ground, bottom) | |
| nethermost(noun, foundation, ground, bottom) | |
| pediment(noun, foundation, ground, bottom) | |
| rest(noun, foundation, ground, bottom) | |
| sole(noun, foundation, ground, bottom) | |
| substructure(noun, foundation, ground, bottom) | |
| undermost(noun, foundation, ground, bottom) | |
| underneath(noun, foundation, ground, bottom) | |
| underpinning(noun, foundation, ground, bottom) | |
| underside(noun, foundation, ground, bottom) |
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| APA | Smart Define. (2015). acme thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/acme/thesaurus/antonyms |
| Chicago | Smart Define. 2015. "acme thesaurus" https://smartdefine.org/acme/thesaurus/antonyms (accessed September 28, 2026). |
| Harvard | Smart Define 2015, acme thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/acme/thesaurus/antonyms>. |
| MLA | Smart Define. "acme thesaurus" 14 April 2015. Web. 28 September 2026. <https://smartdefine.org/acme/thesaurus/antonyms> |