71 entries under fundamental topic. ×

4
intrinsic(adjective, characteristic, important, significant, natural)
3
bottom(adjective, important, significant, original, essential)
3
crucial(adjective, important, significant, original, essential)
3
embryonic(adjective, simple, beginning, opening, original)
3
necessary(adjective, easy, important, significant, original)
3
vital(adjective, top, important, significant, original)
2
critical(adjective, original, essential, basic)
2
early(adjective, simple, head, beginning, opening)
2
indispensable(adjective, characteristic, important, significant, natural)
2
substratal(adjective, simple, plain, important, significant)
1
absolute(adjective, simple, clean, plain, pure)
1
bottom-line(adjective, important, significant, original, essential)
1
deep-seated(adjective, characteristic, original, essential, basic)
1
immature(simple, basic, imperfect, undeveloped)
1
larval(simple, basic)
1
latent(adjective, characteristic, natural, original, essential)
1
name of game(expression, adjective, idiom, significant, essential)
1
needful(adjective, significant, original, essential, basic)
1
nitty-gritty(adjective, original, basic, absolute)
1
nub(adjective, original, basic, absolute)
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APASmart Define. (2015). elementary thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/elementary/thesaurus/synonyms
ChicagoSmart Define. 2015. "elementary thesaurus" https://smartdefine.org/elementary/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, elementary thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/elementary/thesaurus/synonyms>.
MLASmart Define. "elementary thesaurus" 10 April 2015. Web. 24 September 2026. <https://smartdefine.org/elementary/thesaurus/synonyms>