90 entries under sincere topic. ×

12
perfervid(noun, adjective, strong, keen, intense)
10
emotional(adjective, strong, moving, keen, difficult)
10
hot-blooded(adjective, moving, keen, intense, passionate)
9
blazing(adjective, strong, keen, difficult, intense)
9
vigorous(adjective, keen, warm, intense, energetic)
7
violent(adjective, clear, strong, tough, severe)
6
cordial(adjective, feeling, deep, earnest)
6
devout(adjective, kind, keen, intense, passionate)
6
heartfelt(adjective, strong, keen, difficult, intense)
6
hearty(adjective, feeling, keen, warm, intense)
5
lively(adjective, strong, keen, warm, intense)
4
serious(adjective, keen, intense, passionate, enthusiastic)
4
stormy(adjective, passionate, enthusiastic, lively, hot)
3
deep(adjective, clear, strong, tough, severe)
2
amorous(adjective, warm, tender, passionate, heavy)
2
ecstatic(adjective, moving, keen, intense, passionate)
2
genial(adjective, heat, deep, earnest)
2
genuine(adjective, passionate, ardent, spiritual)
2
unfeigned(adjective, keen, intense, passionate, enthusiastic)
2
warmhearted(adjective, keen, intense, passionate, enthusiastic)
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APASmart Define. (2015). fervid thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/fervid/thesaurus/synonyms
ChicagoSmart Define. 2015. "fervid thesaurus" https://smartdefine.org/fervid/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2015, fervid thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/fervid/thesaurus/synonyms>.
MLASmart Define. "fervid thesaurus" 17 July 2015. Web. 29 September 2026. <https://smartdefine.org/fervid/thesaurus/synonyms>