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The Collaborative International Dictionary
Groundly

Groundly \Ground"ly\, adv. Solidly; deeply; thoroughly. [Obs.]

Those whom princes do once groundly hate, Let them provide to die as sure us fate.
--Marston.

Wiktionary
groundly

a. (context rare archaic English) thorough, complete; solid; deep; profound adv. (context rare archaic English) To the very ground, to the very bottom; thoroughly, completely; solidly; deeply; profoundly