impregnably

English

Etymology

From impregnable +‎ -ly.

Adverb

impregnably (comparative more impregnably, superlative most impregnably)

1. In an impregnable manner; so as to defy attack.

References

• William Dwight Whitney, Benjamin E[li] Smith, editors (1911), “impregnably”, in The Century Dictionary […], New York, N.Y.: The Century Co., →OCLC.