180 entries under serious topic. ×

6
persistent(adjective, energetic, active, resolute)
6
tenacious(adjective, resolute, persistent, unwavering)
5
attentive(adjective, set, kind, reasonable, keen)
5
candid(adjective, open, honest, total, passionate)
5
close(adjective, strong, hard, severe, harsh)
5
ruminative(adjective, reasonable, rational, thoughtful, sober)
5
steadfast(adjective, complete, warm, total, sensible)
5
unfeigned(adjective, open, keen, warm, honest)
4
busy(adjective, strong, enthusiastic, active, thoughtful)
4
dignified(adjective, calm, dull, quiet, cool)
4
dogged(adjective, energetic, active, resolute)
4
painstaking(adjective, active, careful, regular)
4
real(adjective, open, honest, total, passionate)
4
sobersided(adjective, work, heavy)
4
straightforward(adjective, open, honest, true, straight)
4
thorough(adjective, careful, regular, resolute)
3
bona fide(expression, adjective, idiom, open, warm)
3
deliberate(adjective, calm, quiet, cool, firm)
3
fixed(adjective, firm, important, certain, sober)
3
realistic(adjective, calm, sensible, dark, restrained)
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APASmart Define. (2016). earnest thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/earnest/thesaurus/synonyms
ChicagoSmart Define. 2016. "earnest thesaurus" https://smartdefine.org/earnest/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2016, earnest thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/earnest/thesaurus/synonyms>.
MLASmart Define. "earnest thesaurus" 24 March 2016. Web. 29 September 2026. <https://smartdefine.org/earnest/thesaurus/synonyms>