45 entries under adjective topic. ×

12
serious(severe, grim, somber, humorless)
9
grave
9
sober
8
grim
7
earnest
7
sedate
7
severe(stern, uncompromising)
7
solemn
7
staid
5
humorless
4
sobersided
4
sombre
3
dour
3
humourless
3
mirthless
3
po-faced
3
somber
3
straight-faced
3
thoughtful
2
gloomy
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APASmart Define. (2015). unsmiling thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/unsmiling/thesaurus/synonyms
ChicagoSmart Define. 2015. "unsmiling thesaurus" https://smartdefine.org/unsmiling/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2015, unsmiling thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/unsmiling/thesaurus/synonyms>.
MLASmart Define. "unsmiling thesaurus" 10 April 2015. Web. 26 September 2026. <https://smartdefine.org/unsmiling/thesaurus/synonyms>