In a manner done without seeing or without awareness; recklessly or without careful thought.
From 'blinded' (past participle of blind) plus the adverb suffix '-ly', which comes from Old English 'lice' meaning 'body' or 'form.' The word evolved to mean doing something in the state of being blinded or without proper vision or judgment.
This word captures something genuinely interesting about English: we can turn almost any adjective into an adverb by adding '-ly,' which lets us describe not just actions but the *manner* or *spirit* in which we do them. 'Blindedly' suggests not just acting blind, but embracing that blindness as a way of being.
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