Tā màorán xíngdòng, jiéguǒ fùchū le chénzhòng de dàijià.
He acted rashly and ended up paying a heavy price.
Tips
usage
贸然 always precedes a verb and typically describes negative or regrettable impulsive actions. It appears frequently in formal writing and cautionary advice. Common collocations: 贸然行动, 贸然决定, 贸然表态.