In a blundering manner; clumsily, carelessly, or making mistakes.
From 'blundering' (the present participle of 'blunder') plus the adverb-forming suffix '-ly,' which comes from Old English '-lice' meaning 'in the manner of.' This creates adverbs from adjectives or participles.
Adding '-ly' to 'blundering' turns an action into an adverb describing how something is done—so 'blunderingly' describes moving through the world making mistakes at every step.
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