365 entries under adjective topic. ×

1
habitual(dull, steady, stable, regular)
1
hands off(expression, quiet, indifferent, apathetic)
1
hanging tough(expression, firm, determined, usual)
1
homogeneous(dull, steady, stable, regular)
1
iceberg(calm, detached, sober, unfeeling)
1
idle(quiet, indifferent, apathetic, lifeless)
1
immutable(dull, steady, stable, regular)
1
impartial(calm, detached, sober, unfeeling)
1
impersonal(calm, detached, sober, unfeeling)
1
in control(expression, tranquil, unperturbed)
1
inactive(quiet, cool, indifferent, still)
1
indurated(cool, blank, aloof, unemotional)
1
inert(quiet, indifferent, apathetic, lifeless)
1
inexpressive(cool, blank, aloof, unemotional)
1
insensible(cool, blank, aloof, unemotional)
1
insusceptible(cool, blank, aloof, unemotional)
1
intent(firm, determined, usual, regular)
1
invariable(dull, steady, stable, regular)
1
inveterate(firm, determined, usual, regular)
1
ironclad(firm, determined, usual, regular)
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APASmart Define. (2015). unflappable thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/unflappable/thesaurus/synonyms
ChicagoSmart Define. 2015. "unflappable thesaurus" https://smartdefine.org/unflappable/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, unflappable thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/unflappable/thesaurus/synonyms>.
MLASmart Define. "unflappable thesaurus" 10 April 2015. Web. 25 September 2026. <https://smartdefine.org/unflappable/thesaurus/synonyms>