| expeditiously(vigorously, earnestly, actively, hastily, carefully) | |
| expertly | |
| fatal | |
| feelingly(adverb, severely, thoroughly, completely, intensely) | |
| ferociously(adverb, fast, sprightly, severely, intensely) | |
| fervidly | |
| fiercely(adverb, fast, severely, intensely, vigorously) | |
| finely | |
| fixedly | |
| flagitiously | |
| for a certainty(expression, idiom) | |
| forcibly(adverb, fast, sprightly, severely, intensely) | |
| formally | |
| forsooth | |
| frantically(adverb, fast, sprightly, severely, intensely) | |
| fully | |
| fundamentally | |
| genuinely(adverb, severely, really, thoroughly, completely) | |
| gloomy | |
| grandly |
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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> |