- Definitions|2
- Thesaurus|671
- Abbreviations|0
87 entries under basic topic. ×
| required(adjective, important, significant, serious, essential) | |
| essential(adjective, characteristic, important, significant, original) | |
| necessary(adjective, important, significant, original, essential) | |
| imperative(adjective, important, significant, serious, essential) | |
| requisite(adjective, important, significant, original, essential) | |
| vital(adjective, important, significant, original, serious) | |
| crucial(adjective, important, significant, original, serious) | |
| important(adjective, significant, serious, essential, critical) | |
| obligatory(adjective, important, significant, essential, critical) | |
| mandatory(adjective, set, significant, essential) | |
| needed(adjective, set, important, significant, essential) | |
| fundamental(adjective, characteristic, important, significant, natural) | |
| needful(adjective, set, important, significant, capital) | |
| compulsory(adjective, set, important, significant, essential) | |
| prerequisite(adjective, important, significant, essential, critical) | |
| urgent(adjective, important, significant, serious, essential) | |
| key(adjective, important, significant, essential, critical) | |
| unavoidable(adjective, set, significant, essential) | |
| cardinal(adjective, important, significant, original, essential) | |
| central(adjective, important, significant, serious) |
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| APA | Smart Define. (2015). indispensable thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/indispensable/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "indispensable thesaurus" https://smartdefine.org/indispensable/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, indispensable thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/indispensable/thesaurus/synonyms>. |
| MLA | Smart Define. "indispensable thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/indispensable/thesaurus/synonyms> |