In the law of contracts, the doctrine of unconscionability allows a court to refuse to enforce a contract or a specific clause within it if the terms are so one-sided or oppressive that they 'shackle' the conscience. To establish unconscionability, a party must typically demonstrate both procedural and substantive unfairness. Procedural unconscionability focuses on the circumstances surrounding the formation of the contract, such as a significant inequality in bargaining power, the use of fine print or complex language, or the lack of a meaningful choice for one of the parties. Substantive unconscionability, by contrast, focuses on the actual terms of the contract and whether they are overly harsh or one-sided. The unconscionability doctrine is intended to protect vulnerable parties from being exploited in transactions where they have little or no bargaining power. However, courts are generally reluctant to invoke the doctrine, as it conflicts with the principle of freedom of contract, which holds that parties should be free to set their own terms without judicial interference.