鲁莽 (lǔ mǎng): 성급하다.

He rushed rashly into the fire before he understood the situation, and as a result, he was overcome by thick smoke and fainted. Fortunately, the firefighters arrived in time and rescued him.

In business negotiations, making concessions rashly may make the other party think you lack experience, and thus they may make more unreasonable demands.

He has always driven recklessly, often speeding and running red lights. His friends all advised him to be careful, but he never listened, and it was not until he had a car accident last month that he regretted it deeply.

She has a rash personality and never considers the consequences when speaking or acting, so she offended quite a few colleagues. It was not until she was criticized by her boss that she began to reflect on her behavior.

When investing in the stock market, rashly following trends often leads to severe losses, while rationally analyzing a company's fundamentals is what brings stable returns.