In a brave, courageous, or strong manner; showing the qualities of being doughty through one's actions and behavior.
From 'doughty' + adverbial suffix '-ly.' The suffix '-ly' comes from Old English '-lice,' meaning 'in the manner of,' attached to the adjective to create the adverb form.
You'll find this word sprinkled throughout fantasy novels and historical fiction because it's one of those perfectly archaic-sounding words that makes readers immediately picture a brave medieval knight charging into battle.
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