In a manner characterized by strong gusts or with gustiness; in a blustery way.
From 'gustful' (full of gusts) plus the English adverbial suffix '-ly,' ultimately from Old Norse 'gustr.'
Adverbs formed from '-ful' adjectives often sound awkward (like 'gracefully' vs. 'with grace'), and 'gustfully' is rarely used—meteorologists and writers usually just say 'windily' or 'in gusts' instead.
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