priceless
adjective uk/ˈpraɪs.ləs/ us/ˈpraɪs.ləs/
B2 贵重的，无价的
A priceless object has such a high value, especially because it is rare, that the price of it cannot be calculated.
A priceless collection of vases was destroyed. 一批贵重的花瓶被毁坏了。
figurative Her knowledge and experience would make her a priceless (= extremely useful) asset to the team. 渊博的知识和丰富的经验会使她成为队中的无价之宝。
informal极其好笑的
extremely funny to see or hear
You should have seen the look on her face when I told her - it was priceless! 你真应该看看我告诉她时她脸上的表情——太好笑了！