| greatly | |
| heart and soul(expression, idiom, resolution) | |
| heavily(adverb, fast, sprightly, severely, intensely) | |
| resolutely(adverb, resolution) | |
| significantly(adverb, urgently, importantly) | |
| staidly | |
| actively(adverb, fast, sprightly, severely, intensely) | |
| candidly | |
| demurely | |
| devoutly | |
| disadvantageously | |
| hard(adverb, fast, badly, severely, intensely) | |
| heartily(adverb, sincerely) | |
| intently | |
| passionately(adverb, severely, thoroughly, completely, extremely) | |
| purposefully(adverb, thoroughly, vigorously, earnestly, actively) | |
| sadly(adverb, severely, thoroughly, completely, affirmation) | |
| sedately | |
| somberly(adverb, sadly, grimly, sternly, sorrowfully) | |
| vigorously(adverb, fast, intensely, fiercely, earnestly) |
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| APA | Smart Define. (2016). seriously thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/seriously/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "seriously thesaurus" https://smartdefine.org/seriously/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2016, seriously thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/seriously/thesaurus/synonyms>. |
| MLA | Smart Define. "seriously thesaurus" 31 March 2016. Web. 23 September 2026. <https://smartdefine.org/seriously/thesaurus/synonyms> |