137 entries under adjective topic. ×

25
hefty(hard, difficult, heavy, complex)
25
weighty(hard, difficult, heavy, important)
22
grave(hard, difficult, important, complex)
22
massive(hard, difficult, heavy, complex)
22
ponderous(hard, difficult, heavy, complex)
22
serious(hard, difficult, important, complex)
21
tough(hard, difficult, complex)
20
burdensome(hard, difficult, heavy, complex)
19
grievous(hard, difficult, complex)
19
leaden(hard, difficult, complex)
19
massy(hard, difficult, complex)
18
burly(hard, difficult, complex)
18
rugged(hard, difficult, complex)
18
severe(hard, difficult, complex)
9
notable(noun, figure, important, star)
8
gargantuan
8
major(great, important, serious)
7
heavy(noun, order, great, tough)
6
big(great, informal, heavy, important)
6
chief(noun, order, superior, heavy)
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APASmart Define. (2016). heavyweight thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/heavyweight/thesaurus/synonyms
ChicagoSmart Define. 2016. "heavyweight thesaurus" https://smartdefine.org/heavyweight/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2016, heavyweight thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/heavyweight/thesaurus/synonyms>.
MLASmart Define. "heavyweight thesaurus" 26 February 2016. Web. 24 September 2026. <https://smartdefine.org/heavyweight/thesaurus/synonyms>