| unquestioningly | |
| very | |
| vivaciously(adverb, fast, intensely, fiercely, vigorously) | |
| weightily | |
| wholeheartedly | |
| zealously(adverb, vigorously, earnestly, hastily, truly) | |
| actively intently(expression, vigorously, earnestly, hastily, carefully) | |
| adeptly | |
| affectingly(adverb, severely, thoroughly, completely, intensely) | |
| agilely(vigorously, earnestly, actively, hastily, carefully) | |
| angrily(adverb, fast, sprightly, severely, intensely) | |
| arduously(vigorously, earnestly, actively, hastily, carefully) | |
| ascetically | |
| assent | |
| assiduously(vigorously, earnestly, actively, hastily, carefully) | |
| assuredly | |
| atrociously | |
| austere | |
| austerely | |
| bec et ongles(expression, idiom) |
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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> |