1
guts(noun, law, condition, foundation, essence)
1
high point
1
imaginings(theory, guesstimate, premise)
1
imperative(noun, need, essential, obligation, requirement)
1
important thing
1
indispensability(need, essential, requirement, prerequisite, essentiality)
1
inevitability(need, essential, requirement, prerequisite, essentiality)
1
inexorableness(need, essential, requirement, prerequisite, essentiality)
1
issue
1
joker
1
kernel
1
landmark
1
law(noun, foundation, basic, theory, guesstimate)
1
life or death(expression, idiom, need, essential, requirement)
1
limiting condition
1
material point
1
meat
1
milestone
1
needfulness(need, essential, requirement, prerequisite, essentiality)
1
nitty-gritty(noun, law, condition, heart, essential)
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APASmart Define. (2015). sine qua non thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/sine_qua_non/thesaurus/synonyms
ChicagoSmart Define. 2015. "sine qua non thesaurus" https://smartdefine.org/sine_qua_non/thesaurus/synonyms (accessed September 30, 2026).
HarvardSmart Define 2015, sine qua non thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/sine_qua_non/thesaurus/synonyms>.
MLASmart Define. "sine qua non thesaurus" 10 April 2015. Web. 30 September 2026. <https://smartdefine.org/sine_qua_non/thesaurus/synonyms>