| theoretic | |
| thought(noun, concept, disregard, neglect, idea) | |
| universal | |
| unsubstantial | |
| view(noun, thing, conception, excitant, ideality) | |
| abstruse(adjective, difficult) | |
| actuation(noun, thing, conception, excitant, ideality) | |
| airy | |
| alleged | |
| ambivalent | |
| anecdotal | |
| animating principle(noun, expression, thing, conception, excitant) | |
| apparent | |
| apperception(noun, truth, conception, excitant, ideality) | |
| apprehension | |
| arch | |
| assumed | |
| belief | |
| believed abstraction(noun, expression, thing, conception, excitant) | |
| bend |
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| APA | Smart Define. (2016). concrete thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/concrete/thesaurus/antonyms |
| Chicago | Smart Define. 2016. "concrete thesaurus" https://smartdefine.org/concrete/thesaurus/antonyms (accessed September 27, 2026). |
| Harvard | Smart Define 2016, concrete thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/concrete/thesaurus/antonyms>. |
| MLA | Smart Define. "concrete thesaurus" 31 March 2016. Web. 27 September 2026. <https://smartdefine.org/concrete/thesaurus/antonyms> |