In a fretful manner; with worry, irritation, or restless anxiety.
From 'fretful' plus '-ly' (adverbial suffix converting adjectives to adverbs). Following standard English adverb formation, this word creates the adverbial form needed to describe how an action is performed in a fretful way.
English's system of stacking suffixes (fret → fret-ful → fret-ful-ly) lets us build precise emotional descriptions—fretfully captures the anxious manner of doing something better than just 'anxiously' does!
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