A person who drools or speaks foolish, meaningless words.
From 'drivel' (Old English 'drifol') plus '-er', the common English suffix for someone who does something. Describes a person prone to talking nonsense.
English naturally creates nouns from verbs by adding '-er'—a 'run-ner' runs, a 'teach-er' teaches, and a 'drivel-er' drivels, showing how the language's word-building system is beautifully logical.
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