The story
- Old English · inherited fromhēafodlīċ“at the top, principal, capital, deadly”
- Middle English · inherited fromhedly
- English todayheadly
From Middle English hedly, havedlich, from Old English hēafodlīċ (“at the top, principal, capital, deadly”), equivalent to head + -ly. Cognate with West Frisian haadlik, Dutch hoofdelijk, Middle Low German hö̂vetlī̂k, Middle High German houbetlich (archaic German hauptlich). Piecewise doublet of chefly and chiefly.
Etymology from Wiktionary, CC BY-SA 4.0.