all hat and no cattle
言行不一致，虚有其表
口语·形容虚张声势无实绩
英文释义
someone who talks boastfully or confidently about their abilities or accomplishments, but has no substance or evidence to support their claims
例句
He talks big about his business success, but he's all hat and no cattle—no real results to show.
典故来源
源于美国西部牛仔文化，戴大帽子象征牛仔身份，但无牛群则虚有其表。