- Definitions|2
- Thesaurus|671
- Abbreviations|0
68 entries under significant topic. ×
| required(adjective, important, serious, essential) | |
| essential(adjective, characteristic, important, original) | |
| necessary(adjective, important, original, essential) | |
| imperative(adjective, important, serious, essential) | |
| requisite(adjective, important, original, essential) | |
| vital(adjective, important, original, serious) | |
| crucial(adjective, important, original, serious) | |
| important(adjective, serious, essential, critical) | |
| obligatory(adjective, important, essential, critical) | |
| mandatory(adjective, set, essential, basic) | |
| needed(adjective, set, important, essential) | |
| fundamental(adjective, characteristic, important, natural) | |
| needful(adjective, set, important, capital) | |
| compulsory(adjective, set, important, essential) | |
| prerequisite(adjective, important, essential, critical) | |
| basic(adjective, characteristic, important, natural) | |
| urgent(adjective, important, serious, essential) | |
| key(adjective, important, essential, critical) | |
| unavoidable(adjective, set, essential, basic) | |
| cardinal(adjective, important, original, essential) |
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| APA | Smart Define. (2015). indispensable thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/indispensable/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "indispensable thesaurus" https://smartdefine.org/indispensable/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2015, indispensable thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/indispensable/thesaurus/synonyms>. |
| MLA | Smart Define. "indispensable thesaurus" 10 April 2015. Web. 23 September 2026. <https://smartdefine.org/indispensable/thesaurus/synonyms> |