| ideation(noun, disregard, neglect, conception, excitant) | |
| illusive | |
| illusory | |
| imaginativeness(noun, certainty, conception, excitant, ideality) | |
| imagined | |
| imaginings(noun, truth, conception, excitant, ideality) | |
| imitate | |
| impellent(noun, thing, conception, excitant, ideality) | |
| imperceptible | |
| impregnation(noun, end, conception, excitant, ideality) | |
| impulse(noun, thing, conception, excitant, ideality) | |
| impulsion(noun, block, decrease, discouragement, conception) | |
| in sight(noun, expression, truth, conception, excitant) | |
| incidental | |
| indefinable | |
| indescribable | |
| indirect | |
| indiscriminate | |
| inexistent | |
| inexpressible |
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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> |