Impermeable vs Impermeably - What's the difference?

impermeable | impermeably |

As an adjective impermeable

is impossible to permeate.

As an adverb impermeably is

in an impermeable manner.

Impermeably vs Imperviously - What's the difference?

impermeably | imperviously |

As adverbs the difference between impermeably and imperviously

is that impermeably is in an impermeable manner while imperviously is in an impervious manner; impenetrably; impermeably.