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• s  unwisely talking too much

• Muppet jaws do not move with each syllable--that would make bigmouthed figures look too agitated--and it takes long practice to learn the knack of mouthing the important syllables .
• Louis Hayward (with a popeyed, bigmouthed, knowing leer) plays the wayward son who, after failing to seduce his future stepmother (Madeleine Carroll), succeeds in seducing the .
• Inevitably his critics said of Lindsay, as La Guardia's foes had said of the Little Flower, that he was a bigmouthed opportunist.

• blabbermouthed
• blabby
• talkative