337 entries under adjective topic. ×

2
compelling(important, significant, serious, essential)
2
cool(bad, tough, top, excellent)
2
deep(original, basic, primary)
2
directing(free, master, prime, absolute)
2
distinguished(bad, great, excellent, fine)
2
elder(rank, post, status, age)
2
especial(unusual, exceptional, special, particular)
2
famous(bad, great, excellent, superior)
2
first-class(bad, tough, top, excellent)
2
first-rate(bad, tough, top, excellent)
2
heavy(noun, order, advance, start)
2
higher(rank, post, status, age)
2
illustrious(excellent, important, famous, significant)
2
imperative(big, important, significant, substantial)
2
impressive(bad, great, excellent, fine)
2
inherent(material, natural, essential, basic)
2
integral(body, material, important, significant)
2
intrinsic(important, significant, original, essential)
2
mainline
2
needful(important, significant, original, capital)
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APASmart Define. (2016). principal thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/principal/thesaurus/synonyms
ChicagoSmart Define. 2016. "principal thesaurus" https://smartdefine.org/principal/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2016, principal thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/principal/thesaurus/synonyms>.
MLASmart Define. "principal thesaurus" 29 March 2016. Web. 27 September 2026. <https://smartdefine.org/principal/thesaurus/synonyms>