105 entries under adjective topic. ×

4
essential(important, vital)
4
grave(dangerous, crucial)
4
key(important, insignificant, essential)
4
outstanding(weak, poor, low)
4
relevant(important, insignificant, substantial, unrelated)
4
useful(important, substantial)
4
worthwhile(important, substantial, worthless)
3
illustrious(bad, poor, famous, prominent)
3
main(common, inferior, principal, predominant)
3
capital(superior, inferior, insignificant, essential)
3
cardinal(important, key)
3
chief(important, essential)
3
considerable(poor, little)
3
critical
3
dire(crucial, urgent)
3
effective
3
eventful
3
fatal(important, critical)
3
fateful
3
foremost(order, first)
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APASmart Define. (2016). unimportant thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/unimportant/thesaurus/antonyms
ChicagoSmart Define. 2016. "unimportant thesaurus" https://smartdefine.org/unimportant/thesaurus/antonyms (accessed September 26, 2026).
HarvardSmart Define 2016, unimportant thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/unimportant/thesaurus/antonyms>.
MLASmart Define. "unimportant thesaurus" 28 March 2016. Web. 26 September 2026. <https://smartdefine.org/unimportant/thesaurus/antonyms>