77 entries under serious topic. ×

2
rational(adjective, calm, quiet, reasonable, sensible)
2
realistic(adjective, calm, sensible, dark, restrained)
2
reflective(adjective, quiet, thoughtful, sober)
2
resolute(adjective, set, severe, honest, thoughtful)
2
restrained(adjective, calm, quiet, reasonable, gentle)
1
abnegating(adjective, calm, quiet, reasonable, sensible)
1
abstaining(adjective, calm, quiet, reasonable, sensible)
1
brooding(adjective, quiet, thoughtful, sober)
1
clear-headed(adjective, calm, quiet, reasonable, sensible)
1
close(adjective, severe, modest, thoughtful, sober)
1
cold sober(expression, adjective, calm, dull, quiet)
1
constant(adjective, thoughtful, sober, sincere)
1
constrained(adjective, calm, quiet, reasonable, sensible)
1
determined(adjective, set, severe, honest, thoughtful)
1
eschewing(adjective, calm, quiet, reasonable, sensible)
1
firm(adjective, severe, thoughtful, sober)
1
fixed(adjective, proper, thoughtful, sober)
1
for real(expression, adjective, thoughtful, sober)
1
forgoing(adjective, calm, quiet, reasonable, sensible)
1
hard-boiled(adjective, calm, sensible, dark, restrained)
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APASmart Define. (2016). solemn thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/solemn/thesaurus/synonyms
ChicagoSmart Define. 2016. "solemn thesaurus" https://smartdefine.org/solemn/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2016, solemn thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/solemn/thesaurus/synonyms>.
MLASmart Define. "solemn thesaurus" 19 February 2016. Web. 29 September 2026. <https://smartdefine.org/solemn/thesaurus/synonyms>