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Webster 1913 Edition

Noun.

[L.

stoliditas

The state or quality of being stolid; dullness of intellect; obtuseness; stupidity.

Indocile, intractable fools, whose

stolidity

can baffle all arguments, and be proof against demonstration itself.

Bentley.

Noun.

[supra.] Dullness of intellect; stupidity. [Little used.]

stolidity ‎(usually uncountable, plural stolidities)

The property of being stolid; unemotionality

Esperanto: flegmo
Russian: невозмути́мость (ru) f ‎(nevozmutímostʹ), бесстра́стность (ru) f ‎(besstrástnostʹ)