365 entries under adjective topic. ×

48
basic(noun, characteristic, drop, part)
42
essential(noun, support, action, characteristic)
31
elementary(characteristic, simple, plain, pure)
30
primary(body, simple, plain, material)
29
organic(important, natural, animate, original)
28
elemental(body, simple, plain, material)
21
underlying(simple, plain, important, straightforward)
20
cardinal(noun, important, head, significant)
19
central(important, significant, original, essential)
18
intrinsic(characteristic, important, significant, natural)
17
necessary(noun, body, material, important)
17
principal(noun, body, material, important)
16
integral(noun, characteristic, part, body)
16
key(noun, important, head, significant)
16
radical(important, significant, original, essential)
16
rudimentary(simple, plain, important, head)
15
prime(body, material, pure, important)
14
basal(body, simple, plain, material)
14
crucial(important, significant, original, capital)
14
vital(body, material, important, significant)
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APASmart Define. (2016). fundamental thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/fundamental/thesaurus/synonyms
ChicagoSmart Define. 2016. "fundamental thesaurus" https://smartdefine.org/fundamental/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2016, fundamental thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/fundamental/thesaurus/synonyms>.
MLASmart Define. "fundamental thesaurus" 29 March 2016. Web. 24 September 2026. <https://smartdefine.org/fundamental/thesaurus/synonyms>