un·con·scio·na·ble /ˌən-'kän-chə-nə-bəl/ adj: unreasonably unfair to one party, marked by oppression, or otherwise unacceptably offensive to public policy
an unconscionable clause
finds the contract...to have been unconscionable at the time it was made — Uniform Commercial Code compare conscionable
un·con·scio·na·bly adv
Merriam-Webster’s Dictionary of Law. Merriam-Webster. 1996.