Present participle of drivel: currently speaking foolishly or drooling.
From 'drivel' (Old English 'drifol') plus '-ing', the suffix showing ongoing action. The 'e' in 'drivel' is dropped before adding '-ing'.
'Driveling' catches the action in the moment—it's the difference between calling someone foolish versus describing the exact moment they're being foolish, making it more vivid and immediate in speech.
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