1The company's decision to expand into the Asian market proved to be a costly mistake due to unforeseen regulatory hurdles.
2Is it true that the new high-speed rail link will be a costly white elephant, with fares too high for most commuters?
3The government has been criticized for its costly and ineffective approach to addressing the housing shortage.
4Avoid costly errors in your tax return by seeking professional advice from a certified accountant.
5The environmental impact of the proposed mining project will be costly not just in financial terms, but also in terms of irreversible ecological damage.