prohibitively

noun | \ ˌprō-ə-ˈbi-shən \ | pro·hi·bi·tion

1. a : an extraordinary writ issued by a higher court commanding an inferior court to keep within its proper jurisdiction (as by ceasing a prosecution)

   b : the period from 1920 to 1933 in the U.S. when the manufacture, transportation, and sale of alcoholic liquors was prohibited by the Eighteenth Amendment to the U.S. Constitution

2. a : something (as a law) that prohibits a certain act or procedure

   b : the period from 1920 to 1933 in the U.S. when the manufacture, transportation, and sale of alcoholic liquors was prohibited by the Eighteenth Amendment to the U.S. Constitution