You searched for: “impregnably
impregnably (adverb), more impregnably, most impregnably
Descriptive of how someone or something is incapable of being brought under control or defeated: The army captain was impregnably encouraging his soldiers to oppose the advancement of their enemies.
This entry is located in the following units: -ably (page 6) prehend-, prehens- (page 2)