96 entries under significant topic. ×

1
extensive(adjective, great, big, important)
1
far-reaching(severe, big, substantial, valuable)
1
heavy number(expression, important, historic)
1
historic(great, extraordinary, important, outstanding)
1
imperative(big, important, substantial, valuable)
1
important serious(expression, important, historic)
1
importunate(big, substantial, valuable, vital)
1
influential(outstanding, vital, eminent, imperative)
1
key(important, large, essential, critical)
1
major(adjective, great, tough, severe, important)
1
marked(big, unusual, substantial, serious)
1
memorable(adjective, informal, unusual, important, famous)
1
mind-blowing(adjective, great, unusual, important, exceptional)
1
necessary(big, important, substantial, valuable)
1
of moment(expression, big, important, substantial)
1
paramount(order, quality, tough, superior, important)
1
primary(order, big, important, substantial)
1
relevant(adjective, great, big, substantial)
1
salient(big, important, substantial, valuable)
1
signal(great, extraordinary, outstanding, splendid)
10 years ago|53k views|share |citing 
APASmart Define. (2016). heavy thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/heavy/thesaurus/synonyms
ChicagoSmart Define. 2016. "heavy thesaurus" https://smartdefine.org/heavy/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2016, heavy thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/heavy/thesaurus/synonyms>.
MLASmart Define. "heavy thesaurus" 25 January 2016. Web. 25 September 2026. <https://smartdefine.org/heavy/thesaurus/synonyms>