52 entries under fundamental topic. ×

1
nitty-gritty(important, essential, critical, basic)
1
pressing(adjective, significant, essential, basic, vital)
1
principal(adjective, important, significant, capital, essential)
1
quintessential(adjective, significant, essential, basic, vital)
1
significant(adjective, important, essential, critical, basic)
1
specified(adjective, significant, essential, basic, vital)
1
unavoidable(adjective, set, significant, essential, basic)
1
underlined(important, essential, critical, basic)
0
bottom line(expression, decisive, imperative)
0
elementary(adjective, significant, essential, basic, vital)
0
main(adjective, important, capital, essential, vital)
0
prime(adjective, significant, essential, basic, vital)
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APASmart Define. (2015). needed thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/needed/thesaurus/synonyms
ChicagoSmart Define. 2015. "needed thesaurus" https://smartdefine.org/needed/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, needed thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/needed/thesaurus/synonyms>.
MLASmart Define. "needed thesaurus" 13 April 2015. Web. 24 September 2026. <https://smartdefine.org/needed/thesaurus/synonyms>