Irrevocable
Part of speech: adjective
Definition: Unable to be retracted or reversed. Final.
Sealed
Part of speech: verb
Definition: To hunt seals.
Part of speech: adjective
Definition: Closed by a seal.Preventing entrance.Not subclassable; from which one cannot inherit.
Example sentence: When we have sealed the outer border and thus stopped the illegal migration, we can talk about any solution.