140 entries under essential topic. ×

1
no alternative(noun, expression, need, requirement)
1
no choice(noun, expression, need, requirement)
1
obligation(noun, want, need, certainty)
1
original(adjective, body, material, important, significant)
1
pinch(need, requirement, prerequisite, essentiality)
1
precondition(need, obligation, requirement, necessity)
1
primordial(adjective, important, significant, original)
1
privation(need, requirement, prerequisite, essentiality)
1
radical(adjective, important, significant, original)
1
right(noun, adjective, want, obligation)
1
rudimentary(adjective, important, significant, original)
1
substratal(adjective, important, significant, original)
1
substrative(adjective, important, significant, original)
1
supporting(adjective, important, significant, original)
1
sustaining(adjective, important, significant, original)
1
theoretical(adjective, important, significant, original)
1
undeniability(noun, need, requirement, prerequisite)
1
underived(adjective, important, significant, original)
1
underlined(important, critical, basic, fundamental)
1
urgency(noun, want, need, certainty)
10 years ago|19k views|share |citing 
APASmart Define. (2015). necessary thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/necessary/thesaurus/synonyms
ChicagoSmart Define. 2015. "necessary thesaurus" https://smartdefine.org/necessary/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, necessary thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/necessary/thesaurus/synonyms>.
MLASmart Define. "necessary thesaurus" 2 November 2015. Web. 24 September 2026. <https://smartdefine.org/necessary/thesaurus/synonyms>