motormouth

/ˈmoʊtərˌmaʊθ/
noun
  1. A person who talks very fast and a lot, often without stopping.
    • In the meeting, the new intern turned into a motormouth and talked for twenty minutes straight.
    • My uncle is such a motormouth that he can finish three stories before anyone else gets a word in.
    • The radio host was a motormouth, filling every second of the show with rapid chatter.
Antonyms
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