90 entries under straightforward topic. ×

2
realistic(adjective, calm, tough, sensible, dark)
2
stolid(adjective, tough, rational, sober)
2
unemotional(adjective, rational, down-to-earth)
2
unfeigned(adjective, open, keen, warm, honest)
1
aboveboard(open, honest, true, straight)
1
actual(open, honest, true, straight)
1
apathetic(adjective, tough, rational, sober)
1
artless(open, honest, true, straight)
1
bona fide(expression, adjective, open, honest, total)
1
candid(adjective, open, warm, honest, total)
1
cold(adjective, calm, close, hard, tough)
1
cold-blooded(adjective, tough, rational, sober)
1
dead-level(open, honest, true, straight)
1
down-to-earth(adjective, calm, tough, plain, restrained)
1
dry(adjective, tough, rational, temperate)
1
earthy(adjective, tough, rational, sober)
1
emotionless(adjective, tough, rational, sober)
1
factual(adjective, tough, rational, sober)
1
feasible(adjective, tough, rational, sober)
1
flat(adjective, tough, rational, sober)
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APASmart Define. (2016). serious thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/serious/thesaurus/synonyms
ChicagoSmart Define. 2016. "serious thesaurus" https://smartdefine.org/serious/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2016, serious thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/serious/thesaurus/synonyms>.
MLASmart Define. "serious thesaurus" 24 February 2016. Web. 25 September 2026. <https://smartdefine.org/serious/thesaurus/synonyms>