In a manner that involves drooling or speaking foolish, meaningless words.
From 'driveling' (the present participle) plus '-ly', the standard English adverb suffix. Describes how something is done in a driveling manner.
Stacking suffixes like 'drivel' + '-ing' + '-ly' shows English's incredible flexibility—we can take a root word and add prefixes and suffixes to shift it from noun to verb to adverb!
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