Superlative form of 'gusty'; most characterized by strong gusts or bursts of wind.
From 'gusty' (full of gusts, from Old Norse 'gustr') plus the English superlative suffix '-est,' used to identify the extreme degree among multiple things.
The superlative '-est' suffix (like 'gustiest,' 'fastest,' 'wisest') comes from Proto-Germanic and shows up in related forms across Germanic languages, showing how deep these grammar patterns run in European language families.
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