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Use "big-mouthed" in a sentence
"And since everyone on earth can be fooled with lies to some degree, you're going to look like a big-mouthed schmuck, when someone does lie to you, and you miss it"
"A teacher pranced before the class in a red cloak, but it was her big-mouthed gator pursuer that …"
"She was terrified to tell me so she told the big-mouthed neighbor kid who told me."