71 entries under solid topic. ×

4
levelheaded(adjective, calm, quiet, cool, moderate)
3
enduring(adjective, calm, quiet, cool, gentle)
3
reliable(adjective, firm, sensible, steady)
3
sensible(adjective, calm, firm, relaxed)
3
sound(adjective, calm, firm, sensible)
3
unshaken(adjective, firm, stable, fixed)
2
firm(adjective, stable, fixed, sturdy)
2
self-assured(adjective, calm, relaxed, certain)
2
steadfast(adjective, firm, sensible, steady)
2
unwavering(adjective, firm, sensible, steady)
1
fast(adjective, firm, sensible, steady)
1
substantial(adjective, firm, stable, fixed)
1
constant(adjective, calm, smooth, firm, sensible)
1
stabile(adjective, calm, smooth, firm)
1
unfluctuating(adjective, calm, smooth, firm)
0
abiding(adjective, firm, stable, fixed)
0
allegiant(adjective, firm, sensible, steady)
0
ardent(adjective, firm, sensible, steady)
0
brick-wall(adjective, firm, stable, fixed)
0
certain(adjective, firm, stable, fixed)
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APASmart Define. (2015). imperturbable thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/imperturbable/thesaurus/synonyms
ChicagoSmart Define. 2015. "imperturbable thesaurus" https://smartdefine.org/imperturbable/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, imperturbable thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/imperturbable/thesaurus/synonyms>.
MLASmart Define. "imperturbable thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/imperturbable/thesaurus/synonyms>