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
-
un- + impregnable
From Wiktionary
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