Synonyms|285Antonyms|76|Broader|4Narrower|0Related|306

68 entries under significant topic. ×

1
decisive(adjective, important, essential, critical)
1
first(important, original, serious, basic)
1
foundational(important, original, basic, vital)
1
grass-roots(important, original, basic, vital)
1
major(important, original, basic, vital)
1
meat-and-potatoes(important, original, essential, critical)
1
meat and potatoes(expression, idiom, important, vital)
1
momentous(adjective, important, substantial, serious)
1
original(characteristic, important, essential, basic)
1
prime(adjective, important, original, serious)
1
primitive(adjective, important, original, essential)
1
primordial(important, original, basic, vital)
1
quintessential(adjective, important, essential, basic)
1
radical(adjective, important, original, essential)
1
rudimentary(important, original, basic, vital)
1
structural(important, original, basic, vital)
1
substratal(adjective, important, original, essential)
1
substrative(important, original, basic, vital)
1
supporting(important, original, basic, vital)
1
sustaining(important, original, basic, vital)
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APASmart Define. (2015). indispensable thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/indispensable/thesaurus/synonyms
ChicagoSmart Define. 2015. "indispensable thesaurus" https://smartdefine.org/indispensable/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2015, indispensable thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/indispensable/thesaurus/synonyms>.
MLASmart Define. "indispensable thesaurus" 10 April 2015. Web. 26 September 2026. <https://smartdefine.org/indispensable/thesaurus/synonyms>