1. a person who talks at length in a foolish, annoying, or incoherent way
Usage: informal; derogatory

Examples

• He's such a blatherer—he talks for hours without saying anything meaningful.
• The meeting was derailed by a blatherer who wouldn't stop rambling.
• Nobody wanted to sit next to the blatherer at dinner.
• She complained that her coworker was a blatherer who wasted everyone's time.
• The blatherer dominated the conversation, leaving no room for others to speak.