81 entries under serious topic. ×

1
resolute(adjective, appearance, severe, honest, terrible)
1
resolved(adjective, severe, honest, thoughtful, sober)
1
restrained(adjective, calm, quiet, reasonable, sensible)
1
sincere(adjective, severe, honest, thoughtful, sober)
1
sound(adjective, calm, quiet, reasonable, sensible)
1
stable(adjective, thoughtful, sober, sincere)
1
steady(adjective, calm, quiet, cool, reasonable)
1
stern(appearance, severe, terrible, sober)
1
unexcited(adjective, calm, quiet, reasonable, sensible)
1
unimpassioned(adjective, calm, quiet, reasonable, sensible)
0
cold sober(expression, adjective, calm, dull, quiet)
0
for real(expression, adjective, thoughtful, sober)
0
mean business(expression, adjective, thoughtful, sober)
0
peaceful dull(expression, calm, quiet, reasonable, dark)
0
playing hard ball(expression, adjective, idiom, thoughtful, sober)
0
calm(adjective, cool, sensible, restrained, sober)
0
deep(adjective, sober, solemn)
0
disapproving(adjective, severe, stern, depressing)
0
inexorable(appearance, severe, terrible, grim)
0
no-fooling(adjective, thoughtful, sober, sincere)
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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>