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

42 entries under obligatory topic. ×

5
pressing(adjective, important, significant, essential, critical)
3
binding(adjective, significant, essential, basic, vital)
3
called for(verb, expression, phrasal verb, essential, requirement)
3
paramount(adjective, important, significant, original, serious)
3
principal(adjective, important, significant, original, serious)
2
bottom-line(adjective, important, significant, original, essential)
2
chief(adjective, important, significant, serious, capital)
2
constraining(adjective, required)
2
elementary(adjective, characteristic, important, significant, natural)
2
exigent(adjective, important, significant, serious, essential)
2
significant(adjective, important, original, serious, essential)
2
wanted(adjective, important, significant, serious, capital)
1
all-important(adjective, important, significant, serious, essential)
1
decisive(adjective, important, significant, essential, critical)
1
momentous(adjective, important, significant, substantial, serious)
1
prime(adjective, important, significant, original, serious)
1
quintessential(adjective, important, significant, essential, basic)
0
de rigueur(expression, adjective, significant, essential, basic)
0
expedient(adjective, significant, essential, basic, vital)
0
incumbent on(expression, adjective, significant, essential, basic)
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APASmart Define. (2015). indispensable thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/indispensable/thesaurus/synonyms
ChicagoSmart Define. 2015. "indispensable thesaurus" https://smartdefine.org/indispensable/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2015, indispensable thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/indispensable/thesaurus/synonyms>.
MLASmart Define. "indispensable thesaurus" 10 April 2015. Web. 27 September 2026. <https://smartdefine.org/indispensable/thesaurus/synonyms>