In a way that shows ability, expertise, or dexterity; done with practiced competence.
From 'skill' (expertise) + '-ful' (full of) + '-ly' (adverb suffix). 'Skill' comes from Old Norse 'skil' (discernment, understanding).
The Old Norse root 'skil' meant 'discernment'—understanding the difference between good and bad—which is why 'skill' really means not just doing something, but doing it with the right understanding of how to do it well.
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