Prohibitive is a synonym of disallowing.
As an adjective prohibitive
is tending to prohibit, preclude, or disallow.
As a noun prohibitive
is (linguistics) negative imperative.
As a verb disallowing is
Tending to prohibit, preclude, or disallow.
Costly to the extreme; beyond budget.
- Some countries are more prohibitive than others when it comes to hot topics like euthanasia and cloning.
- I'd like to visit Europe someday, but the cost is prohibitive right now.
(linguistics) negative imperative