365 entries under adjective topic. ×

4
inborn
4
inbred
4
incipient(head, beginning, opening, original)
4
innate(material, natural, fixed, basic)
4
integrated(simple, whole, united)
4
nascent(start, pure, beginning, opening)
4
needful(important, significant, original, capital)
4
nitty-gritty(noun, part, important, essential)
4
prerequisite(noun, important, need, significant)
4
primeval(harsh, violent, head, beginning)
4
real
4
root(noun, support, action, drop)
4
rooted
4
rudimental(first, previous, elementary, initial)
4
solid(simple, whole, united)
4
supporting(support, important, original, basic)
4
uncluttered
3
abecedarian(simple, straightforward, basic, uncomplicated)
3
absolute(noun, rule, certain, essential)
3
bare
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APASmart Define. (2016). fundamental thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/fundamental/thesaurus/synonyms
ChicagoSmart Define. 2016. "fundamental thesaurus" https://smartdefine.org/fundamental/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2016, fundamental thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/fundamental/thesaurus/synonyms>.
MLASmart Define. "fundamental thesaurus" 29 March 2016. Web. 27 September 2026. <https://smartdefine.org/fundamental/thesaurus/synonyms>