1
frowning
1
funereal(dull, dark, gloomy, sober, serious)
1
glum
1
good(well-mannered, well-behaved)
1
hard-boiled(adjective, calm, sensible, dark, restrained)
1
humorlessly
1
impartial(adjective, indifferent, casual, aloof, remote)
1
impersonal(adjective, indifferent, casual, aloof, remote)
1
incurious(adjective, indifferent, detached, casual, aloof)
1
indifferent(adjective, calm, restrained, casual, aloof)
1
infecund
1
infertile
1
inhibited(adjective, calm, quiet, sensible, dark)
1
inscrutable(adjective, unexcitable)
1
insensible
1
intense(adjective, quiet, firm, sensible, solid)
1
intent(adjective, set, severe, honest, thoughtful)
1
irritable
1
keeping a stiff upper lip(expression, adjective, idiom, calm, relaxed)
1
laid-back(adjective, calm, cool, indifferent, restrained)
10 years ago|16k views|share |citing 
APASmart Define. (2016). staid thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/staid/thesaurus/synonyms
ChicagoSmart Define. 2016. "staid thesaurus" https://smartdefine.org/staid/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2016, staid thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/staid/thesaurus/synonyms>.
MLASmart Define. "staid thesaurus" 19 February 2016. Web. 23 September 2026. <https://smartdefine.org/staid/thesaurus/synonyms>