81 entries under serious topic. ×

5
no-nonsense(adjective, calm, dull, quiet, cool)
5
weighty(adjective, dull, severe, honest, sad)
4
austere(adjective, dull, appearance, severe, honest)
4
oppressive(adjective, dull, severe, obscure, harsh)
4
pensive(adjective, severe, honest, sad, unhappy)
4
subdued(adjective, calm, dull, quiet, soft)
3
dignified(adjective, calm, dull, quiet, cool)
2
decorous(adjective, calm, quiet, cool, sober)
2
forbidding(appearance, severe, terrible, grim)
2
intense(adjective, quiet, sober, grave)
2
portentous(big, heavy, substantial, sober)
2
quiet(adjective, calm, dull, cool, reasonable)
2
severe(adjective, calm, quiet, appearance, reasonable)
2
thoughtful(adjective, dull, quiet, severe, honest)
1
abnegating(adjective, calm, quiet, reasonable, sensible)
1
abstaining(adjective, calm, quiet, reasonable, sensible)
1
clear-headed(adjective, calm, quiet, reasonable, sensible)
1
close(adjective, severe, thoughtful, sober)
1
collected(adjective, calm, quiet, cool, reasonable)
1
composed(adjective, calm, quiet, cool, reasonable)
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APASmart Define. (2016). somber thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/somber/thesaurus/synonyms
ChicagoSmart Define. 2016. "somber thesaurus" https://smartdefine.org/somber/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2016, somber thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/somber/thesaurus/synonyms>.
MLASmart Define. "somber thesaurus" 24 March 2016. Web. 27 September 2026. <https://smartdefine.org/somber/thesaurus/synonyms>