Middle English word hardely comes from Old English heard (Hard.), Old English -līċe

Detailed word origin of hardely

Dictionary entry	Language	Definition
heard	Old English (ang)	Hard.
-līċe	Old English (ang)
heardlīċe	Old English (ang)
heardlice	Old English (ang)	Boldly, bravely, hardily.. Hardly, not easily, inflexibly, severely, harshly, sternly, sorely.
hardliche	Middle English (enm)

Words with the same origin as hardely