80 entries under sober topic. ×

4
glum(adjective, unhappy, unpleasant, sorrow, gloomy)
4
quiet(adjective, calm, dull, cool, reasonable)
3
collected(adjective, calm, quiet, cool, reasonable)
3
cool(adjective, calm, sensible, restrained, thoughtful)
3
sincere(adjective, set, severe, honest, thoughtful)
2
brooding(adjective, quiet, intense, thoughtful)
2
close(adjective, hard, severe, harsh, cruel)
2
decorous(adjective, calm, quiet, cool)
2
keen(adjective, reasonable, sensible, deep, rational)
2
preoccupied(adjective, reasonable, keen, deep, rational)
2
proper(adjective, calm, quiet, cool)
2
resolute(adjective, close, set, severe, honest)
2
restrained(adjective, calm, quiet, reasonable, gentle)
2
solid(adjective, sound, serious, knowledgeable)
2
steady(adjective, calm, quiet, set, cool)
1
absorbed(adjective, reasonable, keen, deep, rational)
1
analytical(adjective, reasonable, keen, deep, rational)
1
brainy(adjective, reasonable, keen, sensible)
1
calculating(adjective, reasonable, keen, deep, rational)
1
cerebral(adjective, reasonable, keen, deep, rational)
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APASmart Define. (2016). grave thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/grave/thesaurus/synonyms
ChicagoSmart Define. 2016. "grave thesaurus" https://smartdefine.org/grave/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2016, grave thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/grave/thesaurus/synonyms>.
MLASmart Define. "grave thesaurus" 29 March 2016. Web. 24 September 2026. <https://smartdefine.org/grave/thesaurus/synonyms>