26 entries under adjective topic. ×

5
humorless
4
humourless
3
serious(somber, weighty, aper, demoniac)
2
sobersided
1
deep(tough, severe, difficult, important)
1
far-reaching(tough, severe, important, deep)
1
fateful(tough, severe, important, deep)
1
formidable(tough, severe, important, deep)
1
grave(set, tough, severe, honest)
1
hard(tough, severe, important, deep)
1
laborious(tough, severe, important, deep)
1
meaning business(expression, tough, severe, deep)
1
meaningful(tough, severe, important, deep)
1
no joke(expression, tough, severe, deep)
1
no laughing matter(expression, idiom, tough, severe)
1
of consequence(expression, tough, severe, deep)
1
operose(tough, severe, important, deep)
1
out for blood(expression, idiom, tough, severe)
1
playing hard ball(expression, idiom, tough, severe)
1
smoking(tough, severe, important, deep)
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APASmart Define. (2013). unhumorous thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/unhumorous/thesaurus/synonyms
ChicagoSmart Define. 2013. "unhumorous thesaurus" https://smartdefine.org/unhumorous/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2013, unhumorous thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/unhumorous/thesaurus/synonyms>.
MLASmart Define. "unhumorous thesaurus" 28 June 2013. Web. 28 September 2026. <https://smartdefine.org/unhumorous/thesaurus/synonyms>