106 entries under substantial topic. ×

2
appreciable(adjective, significant, large, obvious)
2
clear-cut(adjective, clear, plain, exact)
2
discernible(adjective, clear, plain, definite)
2
distinguishable(adjective, exact, significant, obvious)
2
earnest(adjective, strong, intense, big, powerful)
2
estimable(significant, definite, considerable)
2
momentous(adjective, great, solid, extraordinary, superior)
2
observable(adjective, clear, see, serious)
2
of note(expression, big, significant, valuable)
2
perceptible(adjective, clear, plain, obvious)
2
super(adjective, solid, extraordinary, wonderful, exceptional)
1
big(significant, large, valuable, vital)
1
chief(adjective, great, extraordinary, superior, big)
1
crucial(big, important, powerful, significant)
1
decisive(big, important, powerful, significant)
1
detectable(significant, obvious, visible, considerable)
1
determining(big, significant, valuable, vital)
1
essential(adjective, great, big, significant, individual)
1
exigent(big, significant, valuable, vital)
1
extensive(big, significant, large, valuable)
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APASmart Define. (2015). marked thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/marked/thesaurus/synonyms
ChicagoSmart Define. 2015. "marked thesaurus" https://smartdefine.org/marked/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, marked thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/marked/thesaurus/synonyms>.
MLASmart Define. "marked thesaurus" 17 July 2015. Web. 22 September 2026. <https://smartdefine.org/marked/thesaurus/synonyms>