139 entries under original topic. ×

1
meat-and-potatoes(adjective, important, significant, essential)
1
moth-eaten(last, past, venerable, outdated)
1
nitty-gritty(adjective, basic, absolute, fundamental)
1
nub(adjective, basic, absolute, fundamental)
1
of yore(expression, last, venerable, outdated)
1
opening(adjective, head, beginning, prime)
1
out-of-date(adjective, last, odd, old)
1
outdated(adjective, last, odd, old)
1
outmoded(adjective, last, odd, old)
1
paramount(adjective, important, significant, essential)
1
primo(simple, straightforward, basic, fundamental)
1
relic(last, past, venerable, outdated)
1
requisite(adjective, important, significant, essential)
1
rusty(last, past, venerable, outdated)
1
significant(adjective, important, essential, basic)
1
slightest(adjective, head, beginning, opening)
1
smallest(adjective, head, beginning, opening)
1
stale(last, past, venerable, outdated)
1
structural(material, important, natural, basic)
1
substrative(adjective, important, significant, essential)
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APASmart Define. (2015). primitive thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/primitive/thesaurus/synonyms
ChicagoSmart Define. 2015. "primitive thesaurus" https://smartdefine.org/primitive/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, primitive thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/primitive/thesaurus/synonyms>.
MLASmart Define. "primitive thesaurus" 14 April 2015. Web. 25 September 2026. <https://smartdefine.org/primitive/thesaurus/synonyms>