prohibitive
US /proʊˈhɪb.ə.t̬ɪv/
UK /proʊˈhɪb.ə.t̬ɪv/

1.
too high to be paid or charged
:
•
The cost of the new car was prohibitive for most families.
•
The insurance premiums were so prohibitive that I couldn't afford coverage.
2.
intended to prevent or discourage something
:
•
The new regulations are prohibitive to small businesses.
•
They imposed prohibitive restrictions on imports.