131 entries under adjective topic. ×

1
basement(base, last)
1
blameless
1
cardinal(important, significant, original, basic)
1
central(important, significant, original, basic)
1
chaste
1
clean
1
constitutional(important, significant, original, basic)
1
constitutive(important, significant, original, basic)
1
crucial(important, significant, original, basic)
1
decent
1
duck soup(expression, simple, straightforward, basic)
1
easy(simple, straightforward, basic, fundamental)
1
facile(simple, straightforward, basic, fundamental)
1
faultless
1
first(important, significant, opening, original)
1
grass-roots(important, significant, original, essential)
1
ground(base, last)
1
guiltless
1
honorable
1
immaculate
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APASmart Define. (2015). foundational thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/foundational/thesaurus/synonyms
ChicagoSmart Define. 2015. "foundational thesaurus" https://smartdefine.org/foundational/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, foundational thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/foundational/thesaurus/synonyms>.
MLASmart Define. "foundational thesaurus" 10 April 2015. Web. 24 September 2026. <https://smartdefine.org/foundational/thesaurus/synonyms>