| guts(noun, law, condition, foundation, essence) | |
| high point | |
| imaginings(theory, guesstimate, premise) | |
| imperative(noun, need, essential, obligation, requirement) | |
| important thing | |
| indispensability(need, essential, requirement, prerequisite, essentiality) | |
| inevitability(need, essential, requirement, prerequisite, essentiality) | |
| inexorableness(need, essential, requirement, prerequisite, essentiality) | |
| issue | |
| joker | |
| kernel | |
| landmark | |
| law(noun, foundation, basic, theory, guesstimate) | |
| life or death(expression, idiom, need, essential, requirement) | |
| limiting condition | |
| material point | |
| meat | |
| milestone | |
| needfulness(need, essential, requirement, prerequisite, essentiality) | |
| nitty-gritty(noun, law, condition, heart, essential) |
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| APA | Smart Define. (2015). sine qua non thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/sine_qua_non/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "sine qua non thesaurus" https://smartdefine.org/sine_qua_non/thesaurus/synonyms (accessed September 30, 2026). |
| Harvard | Smart Define 2015, sine qua non thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/sine_qua_non/thesaurus/synonyms>. |
| MLA | Smart Define. "sine qua non thesaurus" 10 April 2015. Web. 30 September 2026. <https://smartdefine.org/sine_qua_non/thesaurus/synonyms> |