Русско-англо-русский юридический словарь

An unconscionable transaction arises in contract law where there is an overwhelming imbalance in the power relationship between the parties [...] On such a claim the material ingredients are proof of inequality in the position of the parties arising out of the ignorance, need or distress of the weaker, which left him in the power of the stronger, and proof of substantial unfairness of the bargain obtained by the stronger. (Disinherited Vancouver)

An unconscionable transaction is one in which no right-minded person would ever make, and no fair-minded person would ever accept. To prove an unconscionable transaction one must prove that: 1. the bargain was made without regard to one's future 2. there was an inequality in the bargaining position of the two parties. (Termium Plus, Government of Canada)