118 entries under significant topic. ×

1
super(adjective, good, great, unusual, important)
1
terrific(adjective, great, unusual, important, exceptional)
1
tidy(large, controlled, considerable, orderly)
1
valuable(adjective, good, big, important)
1
worthwhile(adjective, strong, solid, big, important)
0
abundant(large, considerable)
0
ample(large, considerable)
0
big-deal(large, considerable)
0
bulky(big, heavy, substantial, large)
0
durable(large, considerable)
0
mattering much(expression, big, substantial, valuable)
0
plentiful(large, considerable)
0
sizable(large, considerable)
0
stout(big, heavy, substantial, large)
0
superabundant(large, considerable)
0
superior(adjective, important, critical, prominent)
0
vast(large, considerable)
0
well-built(large, considerable)
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APASmart Define. (2016). serious thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/serious/thesaurus/synonyms
ChicagoSmart Define. 2016. "serious thesaurus" https://smartdefine.org/serious/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2016, serious thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/serious/thesaurus/synonyms>.
MLASmart Define. "serious thesaurus" 24 February 2016. Web. 26 September 2026. <https://smartdefine.org/serious/thesaurus/synonyms>