111 entries under serious topic. ×

5
calm(adjective, cool, sensible, restrained, sober)
5
dull(adjective, quiet, severe, dark, heavy)
4
composed(adjective, calm, quiet, cool, reasonable)
4
dreadful(adjective, severe, intense, unpleasant, terrible)
4
forbidding(adjective, close, hard, severe, harsh)
4
glum(adjective, unhappy, unpleasant, sorrow, gloomy)
4
imperturbable(adjective, calm, cool, sensible, dark)
4
quiet(adjective, calm, dull, cool, reasonable)
3
collected(adjective, calm, quiet, cool, reasonable)
3
cool(adjective, calm, sensible, restrained, thoughtful)
3
horrible(adjective, severe, intense, unpleasant, extreme)
3
sincere(adjective, set, severe, honest, thoughtful)
3
sobersided
3
sound(adjective, calm, quiet, reasonable, dark)
2
brooding(adjective, quiet, intense, thoughtful, sober)
2
close(adjective, hard, severe, harsh, cruel)
2
cold(adjective, calm, close, hard, severe)
2
decisive(adjective, severe, big, significant, substantial)
2
decorous(adjective, calm, quiet, cool, sober)
2
drab(adjective, calm, dull, quiet, reasonable)
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APASmart Define. (2016). grave thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/grave/thesaurus/synonyms
ChicagoSmart Define. 2016. "grave thesaurus" https://smartdefine.org/grave/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2016, grave thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/grave/thesaurus/synonyms>.
MLASmart Define. "grave thesaurus" 29 March 2016. Web. 27 September 2026. <https://smartdefine.org/grave/thesaurus/synonyms>