Unimpregnable Definition

adjective

Not impregnable; capable of being pierced or assailed.

Wiktionary

Incapable of being impregnated; impermeable or infertile.

The compound rendered the surface of the vessel unimpregnable.
Despite fertility treatment, one out of three women in the study remained unimpregnable.
Wiktionary

Origin of Unimpregnable

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unimpregnable