prōˈhibəd.iv, prəˈ-, -bətiv adjective
Etymology: French prohibitif, from Late Latin prohibitivus, from Latin prohibitus (past participle of prohibēre to prohibit) + -ivus -ive — more at prohibit
1. : tending to prohibit or interdict : restraining from a desired course or action
the prohibitive power of the police
can be expressed without meeting anger or ridicule in a prohibitive measure — Christopher Sykes
2. : serving to preclude the use of something — usually used of a price or a tax
the price … was almost prohibitive — A.G.DuMez
the rise of prohibitive taxes and inheritance dues — F.B.Millett