A usurious price or rate of interest is one that is unfairly high.

usurious interest rates 高利贷利率

Store cards may charge usurious rates, but they are not designed for taking extended credit. 商店发行的信用卡虽然会征收高利贷般的逾期还款利率，但是发行这种卡的本意就不是为了给予顾客超长的信贷还款期。

relating to usury (= lending money at a rate of interest that is too high)

They were becoming increasingly unpopular due to usurious moneylending. 那时他们因为放高利贷而变得愈加令人憎恨。

Clearly this move will drive the poor to the usurious money lender. 这项举措显然会驱使穷人去借高利贷。