Main Entry: un·con·scio·na·ble Pronunciation: "&n-'kän-ch&-n&-b&l Function: adjective : unreasonably unfair to one party, marked by oppression, or otherwise unacceptably offensive to public policy unconscionable clause> unconscionable at the time it was made —Uniform Commercial Code> —compare CONSCIONABLE —un·con·scio·na·blyadverb