Characterized by strong gusts of wind; windy or blustery.
From 'gust' (sudden wind) plus the English suffix '-ful' (full of, characterized by), with Old Norse 'gustr' as the ultimate origin.
The suffix '-ful' turns nouns into adjectives meaning 'full of' or 'characterized by'—so 'gustful' means 'full of gusts,' just like 'graceful' means 'full of grace,' and 'dreadful' means 'full of dread.'
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