groundly /ˈɡɹaʊndli/adverb 2adjective 1forms 2 adverb2 •(no longer used, rare) In a firmly grounded manner; solidly.Walke groundly, / Talke profoundly, / Drinke roundly, / Sleape soundly. — 1562 •(no longer used, rare) To the very ground or bottom; deeply, profoundly; completely, thoroughly.[…] Isope cast his chere to Beryn so groundly, / That atte last there was no man with Isope so pryvy:[…] — 1876 adjective1 •(no longer used, rare) Firmly grounded; solid; of education: complete, thorough, well-grounded. formsmore groundly · most groundly