81 entries under serious topic. ×

1
constant(adjective, thoughtful, sober, sincere)
1
constrained(adjective, calm, quiet, reasonable, sensible)
1
cool(adjective, calm, sensible, restrained, thoughtful)
1
deliberate(adjective, calm, quiet, cool, sober)
1
determined(adjective, severe, honest, thoughtful, sober)
1
eschewing(adjective, calm, quiet, reasonable, sensible)
1
firm(adjective, severe, thoughtful, sober)
1
fixed(adjective, thoughtful, sober, sincere)
1
forgoing(adjective, calm, quiet, reasonable, sensible)
1
hard-boiled(adjective, calm, sensible, dark, restrained)
1
imperturbable(adjective, calm, cool, sensible, dark)
1
inhibited(adjective, calm, quiet, sensible, dark)
1
intent(adjective, severe, honest, thoughtful, sober)
1
levelheaded(adjective, calm, quiet, reasonable, sensible)
1
lucid(adjective, calm, quiet, reasonable, sensible)
1
meaningful(adjective, dull, quiet, severe, big)
1
muted(adjective, dull, quiet, soft, severe)
1
practical(adjective, calm, sensible, dark, restrained)
1
rational(adjective, calm, quiet, reasonable, sensible)
1
realistic(adjective, calm, sensible, dark, restrained)
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APASmart Define. (2016). somber thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/somber/thesaurus/synonyms
ChicagoSmart Define. 2016. "somber thesaurus" https://smartdefine.org/somber/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2016, somber thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/somber/thesaurus/synonyms>.
MLASmart Define. "somber thesaurus" 24 March 2016. Web. 28 September 2026. <https://smartdefine.org/somber/thesaurus/synonyms>