107 entries under basic topic. ×
| compulsory(adjective, significant, essential, vital) | |
| concealed(adjective, original, fundamental, primary) | |
| de rigueur(expression, adjective, significant, essential) | |
| decisive(adjective, significant, essential, vital) | |
| deep(intense, powerful, original, primary) | |
| deep-seated(original, absolute, fundamental, primary) | |
| exigent(adjective, significant, essential, vital) | |
| expedient(adjective, significant, essential, vital) | |
| hidden(adjective, original, fundamental, primary) | |
| imperative(adjective, significant, essential, vital) | |
| incumbent on(expression, adjective, significant, essential) | |
| latent(adjective, original, fundamental, primary) | |
| lurking(adjective, original, fundamental, primary) | |
| mandatory(adjective, significant, essential, vital) | |
| name of game(expression, adjective, idiom, significant, essential) | |
| natural(material, living, functional, nuclear) | |
| needed(adjective, significant, essential, vital) | |
| obligatory(adjective, significant, essential, vital) | |
| prerequisite(adjective, significant, essential, vital) | |
| pressing(adjective, significant, essential, vital) |
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| APA | Smart Define. (2016). prime thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/prime/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "prime thesaurus" https://smartdefine.org/prime/thesaurus/synonyms (accessed September 20, 2026). |
| Harvard | Smart Define 2016, prime thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/prime/thesaurus/synonyms>. |
| MLA | Smart Define. "prime thesaurus" 29 March 2016. Web. 20 September 2026. <https://smartdefine.org/prime/thesaurus/synonyms> |