| seriously(adverb, badly, severely, completely, poorly) | |
| earnestly(adverb, seriously, vigorously, actively, powerfully) | |
| grimly(adverb, seriously) | |
| solemnly(adverb, down, seriously, vigorously, earnestly) | |
| severely(adverb, badly, completely, seriously, poorly) | |
| soberly(adverb, down, seriously, vigorously, earnestly) | |
| intensely(adverb, badly, severely, completely, seriously) | |
| badly | |
| somberly(adverb, seriously, sadly, grimly, sternly) | |
| staidly | |
| thoughtfully(adverb, down, seriously, vigorously, earnestly) | |
| deeply | |
| demurely(adverb, seriously) | |
| gloomily | |
| sedately(adverb, down, seriously, vigorously, earnestly) | |
| heavily | |
| in earnest(expression, idiom, adverb, seriously, vigorously) | |
| sadly(adverb, severely, thoroughly, completely, seriously) | |
| critically | |
| formally |
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| APA | Smart Define. (2015). gravely thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/gravely/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "gravely thesaurus" https://smartdefine.org/gravely/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, gravely thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/gravely/thesaurus/synonyms>. |
| MLA | Smart Define. "gravely thesaurus" 14 April 2015. Web. 22 September 2026. <https://smartdefine.org/gravely/thesaurus/synonyms> |