41 entries under controlled topic. ×

16
reserved(adjective, calm, quiet, cool, attitude)
10
reticent(adjective, calm, quiet, cool, reasonable)
9
cool(adjective, calm, dull, quiet, reasonable)
8
unemotional(adjective, calm, dull, cool, flat)
7
restrained(adjective, calm, close, quiet, gentle)
6
retiring(adjective, calm, close, quiet, reasonable)
4
calm(adjective, quiet, cool, reasonable, mild)
4
quiet(adjective, calm, reasonable, mild, restrained)
2
chilled(calm, quiet, reasonable, mild)
2
discreet(calm, quiet, reasonable, mild)
2
self-controlled(adjective, calm, quiet, gentle, mild)
2
shrinking(adjective, calm, quiet, reasonable, mild)
2
subdued(calm, quiet, reasonable, mild)
2
unaffable(calm, quiet, reasonable, mild, reticent)
2
unexpansive(calm, quiet, reasonable, mild, reticent)
2
unobtrusive(adjective, calm, quiet, reasonable, mild)
1
bottled up(expression, calm, quiet, reasonable, mild)
1
calm and collected(expression, calm, quiet, reasonable, mild)
1
conservative(calm, quiet, reasonable, mild)
1
corked up(expression, calm, quiet, reasonable, mild)
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APASmart Define. (2015). undemonstrative thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/undemonstrative/thesaurus/synonyms
ChicagoSmart Define. 2015. "undemonstrative thesaurus" https://smartdefine.org/undemonstrative/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, undemonstrative thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/undemonstrative/thesaurus/synonyms>.
MLASmart Define. "undemonstrative thesaurus" 14 April 2015. Web. 22 September 2026. <https://smartdefine.org/undemonstrative/thesaurus/synonyms>