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