147 entries under fundamental topic. ×

1
latent(adjective, characteristic, natural, original, essential)
1
mandatory(adjective, significant, essential, vital)
1
meaningful(important, essential, critical, imperative)
1
name(important, essential, critical, key)
1
name-of-the-game(important, essential, critical, key)
1
name of game(noun, expression, adjective, idiom, significant)
1
nitty-gritty(noun, adjective, law, important, emotion)
1
nub(noun, adjective, emotion, original, essential)
1
quintessential(adjective, important, significant, essential, vital)
1
simplest(simple, straightforward, uncomplicated, elementary)
1
underlined(important, essential, critical, key)
1
universal law(noun, expression, rule, belief, statement)
1
unwritten rule(noun, expression, rule, belief, statement)
1
urgent(adjective, important, significant, essential, critical)
1
vital part(noun, expression, condition, essential, essence)
0
all-important(adjective, significant, essential, vital)
0
bare-bones(noun, simple, stark, shorts)
0
binding(adjective, significant, essential, vital)
0
categorical(adjective, essential, supreme)
0
compelling(adjective, significant, essential, vital)
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APASmart Define. (2015). basic thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/basic/thesaurus/synonyms
ChicagoSmart Define. 2015. "basic thesaurus" https://smartdefine.org/basic/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, basic thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/basic/thesaurus/synonyms>.
MLASmart Define. "basic thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/basic/thesaurus/synonyms>