53 entries under hard topic. ×

47
grave(adjective, dull, great, tough)
46
serious(adjective, good, dull, great)
36
massive(adjective, difficult, heavy, complex)
35
ponderous(adjective, difficult, big, heavy)
35
burdensome(adjective, difficult, heavy, complex)
35
hefty(adjective, difficult, harsh, solid)
31
grievous(adjective, great, tough, severe)
30
severe(adjective, tough, difficult, honest)
29
oppressive(adjective, difficult, heavy, complex)
25
tough(adjective, difficult, heavy, complex)
24
ambitious(adjective, difficult, importance, complex)
24
profound(adjective, difficult, complex, thoughtful)
24
taxing(adjective, difficult, heavy, complex)
23
difficult(adjective, heavy, complex)
23
heavyweight(adjective, difficult, heavy, important)
23
leaden(adjective, difficult, heavy, complex)
22
trying(adjective, difficult, heavy, complex)
21
arduous(adjective, difficult, heavy, complex)
21
backbreaking(adjective, difficult, heavy, complex)
21
massy(adjective, difficult, complex)
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APASmart Define. (2015). weighty thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/weighty/thesaurus/synonyms
ChicagoSmart Define. 2015. "weighty thesaurus" https://smartdefine.org/weighty/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, weighty thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/weighty/thesaurus/synonyms>.
MLASmart Define. "weighty thesaurus" 14 April 2015. Web. 25 September 2026. <https://smartdefine.org/weighty/thesaurus/synonyms>