Headly definitions

(archaic) Chief; principal; capital; (of sins) deadly.
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In a headly manner; impetuously; precipitately; headily.
adverb
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(archaic) Heady; violent; impetuous.
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Origin of headly

From Middle English hedly, havedlich, from Old English hēafodlīċ (“at the top, principal, capital, deadly”), equivalent to head +‎ -ly.