20
seriously(adverb, badly, severely, completely, poorly)
14
earnestly(adverb, seriously, vigorously, actively, powerfully)
14
grimly(adverb, seriously)
14
solemnly(adverb, down, seriously, vigorously, earnestly)
13
severely(adverb, badly, completely, seriously, poorly)
13
soberly(adverb, down, seriously, vigorously, earnestly)
13
intensely(adverb, badly, severely, completely, seriously)
12
badly
8
somberly(adverb, seriously, sadly, grimly, sternly)
8
staidly
8
thoughtfully(adverb, down, seriously, vigorously, earnestly)
7
deeply
7
demurely(adverb, seriously)
7
gloomily
7
sedately(adverb, down, seriously, vigorously, earnestly)
6
heavily
6
in earnest(expression, idiom, adverb, seriously, vigorously)
5
sadly(adverb, severely, thoroughly, completely, seriously)
5
critically
5
formally
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APASmart Define. (2015). gravely thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/gravely/thesaurus/synonyms
ChicagoSmart Define. 2015. "gravely thesaurus" https://smartdefine.org/gravely/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, gravely thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/gravely/thesaurus/synonyms>.
MLASmart Define. "gravely thesaurus" 14 April 2015. Web. 22 September 2026. <https://smartdefine.org/gravely/thesaurus/synonyms>