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Impregnable vs Unassailable - What's the difference?

impregnable | unassailable |

As adjectives the difference between impregnable and unassailable

is that impregnable is too strong to be penetrated or impregnable can be capable of being impregnated while unassailable is secure against attack; impregnable.

impregnable

English

Etymology 1

From (etyl) imprenable, . Intrusive g added 16c on model of deign, reign.

Adjective

(en adjective)
  • Too strong to be penetrated.
  • * South
    • The man's affection remains wholly unconcerned and impregnable .
  • * {{quote-news
    • , year=2011 , date=October 2 , author=Jonathan Jurejko , title=Bolton 1 - 5 Chelsea , work=BBC Sport citation , page= , passage=And with Bolton suffering a wretched run of five straight home defeats - their worst run in 109 years - Chelsea fans would have been forgiven for expecting a comfortable win.
    But surely they did not anticipate the ease with which their team raced into an almost impregnable half-time lead.}}

    Etymology 2

    From .

    Adjective

    (en adjective)
  • Capable of being impregnated.
    • Following treatment, twenty percent of previously infertile females were impregnable .
    Application of the compound rendered the non-porous surface impregnable .

    References

    * Webster's Third New International Dictionary (1966).

    unassailable

    English

    Adjective

    (-)
  • secure against attack; impregnable
  • (by extension) undeniable, incontestable or incontrovertible
    • She won the debate with her unassailable logic.