impregnably

English

Etymology

impregnable +‎ -ly

Adverb

impregnably (comparative more impregnably, superlative most impregnably)

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

References

• “impregnably”, in The Century Dictionary […], New York, N.Y.: The Century Co., 1911, →OCLC.