30 entries under unflappability topic. ×

16
apathy(noun, disregard, feelings, dullness, inactivity)
16
indifference(noun, disregard, feelings, dullness, apathy)
15
lethargy(noun, disregard, feelings, dullness, apathy)
12
impassivity(noun, disregard, feelings, dullness, apathy)
12
stolidity(noun, disregard, feelings, apathy, indifference)
9
unconcern(noun, disregard, feelings, dullness, apathy)
8
disinterest(noun, disregard, feelings, dullness, apathy)
8
listlessness(noun, disregard, feelings, dullness, apathy)
7
composure(noun, calmness, coolness, levelheadedness)
7
dullness(noun, disregard, apathy, inactivity, indifference)
7
emotionlessness(noun, disregard, apathy, indifference, calmness)
7
insensibility(noun, disregard, feelings, apathy, indifference)
6
equanimity(noun, calmness, composure, levelheadedness)
6
insouciance(noun, disregard, dullness, apathy, inactivity)
6
lassitude(noun, disregard, feelings, dullness, apathy)
5
imperturbability(noun, calmness, composure, coolness)
5
insensibleness(noun, disregard, feelings, apathy, indifference)
5
unresponsiveness(noun, disregard, feelings, apathy, indifference)
4
calmness(noun, composure, coolness, levelheadedness)
4
incuriosity(noun, disregard, feelings, apathy, indifference)
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APASmart Define. (2015). phlegm thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/phlegm/thesaurus/synonyms
ChicagoSmart Define. 2015. "phlegm thesaurus" https://smartdefine.org/phlegm/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, phlegm thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/phlegm/thesaurus/synonyms>.
MLASmart Define. "phlegm thesaurus" 10 April 2015. Web. 25 September 2026. <https://smartdefine.org/phlegm/thesaurus/synonyms>