| honestly | |
| indeed(adverb, affirmation) | |
| actually | |
| all joking aside(expression, idiom, adverb, actively, truly) | |
| animatedly(adverb, fast, intensely, fiercely, vigorously) | |
| ardently(vigorously, earnestly, hastily, carefully, eagerly) | |
| awfully | |
| briskly(adverb, fast, intensely, fiercely, vigorously) | |
| certainly | |
| dependably | |
| deplorably | |
| desperately | |
| determinedly(adverb, earnestly, actively, truly, thoughtfully) | |
| down(adverb, earnestly, actively, truly, thoughtfully) | |
| earnest | |
| energetically(adverb, fast, intensely, fiercely, vigorously) | |
| essentially(adverb, greatness) | |
| firmly(adverb, fast, badly, severely, intensely) | |
| for real(expression, adverb, earnestly, actively, truly) | |
| furiously(adverb, fast, sprightly, severely, intensely) |
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| APA | Smart Define. (2016). seriously thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/seriously/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "seriously thesaurus" https://smartdefine.org/seriously/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2016, seriously thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/seriously/thesaurus/synonyms>. |
| MLA | Smart Define. "seriously thesaurus" 31 March 2016. Web. 22 September 2026. <https://smartdefine.org/seriously/thesaurus/synonyms> |