different between impervious vs unstirred

English

From Latin impervius (“that cannot be passed through”), from in- (“not”) + pervius (“letting things through”)

impervious (comparative more impervious, superlative most impervious)

Unaffected or unable to be affected by something.
Preventive of any penetration; impenetrable, impermeable, particularly of water.
Immune to damage or effect.

un- +? stirred

unstirred (comparative more unstirred, superlative most unstirred)

That has not been mixed by stirring.
Not stirred or emotionally excited.
- 1853, Charlotte Brontë, Villette
  Inadventurous, unstirred by impulses of practical ambition, I was capable of sitting twenty years teaching infants the hornbook, turning silk dresses and making children's frocks.

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