The difference between Slowly and With leaden wings
When used as adverbs, slowly means at a slow pace, whereas with leaden wings means very slowly in progress or the passage of time.
check bellow for the other definitions of Slowly and With leaden wings
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Slowly as an adverb (manner):
At a slow pace.
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With leaden wings as an adverb (obsolete):
Very slowly in progress or the passage of time.