147 entries under significant topic. ×

10
first(adjective, important, original, prominent)
10
relevant(adjective, importance, big, substantial)
9
basal(adjective, body, simple, plain, material)
9
compulsory(adjective, set, important, critical)
9
influential(adjective, importance, big, important)
9
interior(adjective, important, basic, main)
9
outstanding(adjective, importance, important, valuable)
8
big(adjective, importance, important, substantial)
8
considerable(adjective, importance, big, substantial)
8
foremost(adjective, importance, big, important)
8
paramount(adjective, importance, important, original)
8
urgent(adjective, severe, big, important)
7
all-important(adjective, important, serious, critical)
7
major(adjective, important, original, substantial)
6
pressing(adjective, big, important, substantial)
6
primitive(adjective, body, simple, plain, material)
6
quintessential(adjective, characteristic, important, common, ordinary)
5
inmost(adjective, important, basic, intimate)
5
original(adjective, characteristic, body, simple, plain)
5
wanted(adjective, important, serious, capital)
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APASmart Define. (2016). essential thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/essential/thesaurus/synonyms
ChicagoSmart Define. 2016. "essential thesaurus" https://smartdefine.org/essential/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2016, essential thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/essential/thesaurus/synonyms>.
MLASmart Define. "essential thesaurus" 31 March 2016. Web. 24 September 2026. <https://smartdefine.org/essential/thesaurus/synonyms>