2
monolithic
2
monotonous
2
mundane(adjective, tough, rational, straightforward, sober)
2
neutral(adjective, unexcitable)
2
nonsensical(dull, unintelligent, witless)
2
patient(adjective, calm, quiet, cool, indifferent)
2
peaceful
2
phlegmatical
2
poker-faced(adjective, dull, quiet, cool, indifferent)
2
prosy(adjective, tough, rational, straightforward, sober)
2
quiescent(adjective, quiet, indifferent, still, fixed)
2
quiet(adjective, calm, dull, flat, slow)
2
remote(adjective, indifferent, casual, aloof, unemotional)
2
rigid(adjective, still, fixed, motionless, stationary)
2
sappy
2
scatterbrained(adjective, simple, slow, stupid, sluggish)
2
serious(adjective, tough, rational, straightforward, sober)
2
smooth
2
sober(adjective, calm, cool, tough, rational)
2
soft
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APASmart Define. (2016). stolid thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/stolid/thesaurus/synonyms
ChicagoSmart Define. 2016. "stolid thesaurus" https://smartdefine.org/stolid/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2016, stolid thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/stolid/thesaurus/synonyms>.
MLASmart Define. "stolid thesaurus" 3 March 2016. Web. 25 September 2026. <https://smartdefine.org/stolid/thesaurus/synonyms>