1. tending to talk too much or reveal secrets; indiscreet in speech
Usage: informal
2. having a large mouth
Usage: literal sense

Examples

• Don’t tell Sarah the surprise party details – she’s too bigmouthed.
• The bigmouthed student couldn’t keep the test answers to himself.
• I regret being so bigmouthed about my friend’s personal problems.
• The bigmouthed bass had no trouble swallowing the large lure.
• Her bigmouthed cousin always spreads family gossip around town.
• The bigmouthed frog could catch insects other frogs couldn’t.