irreversible
//ˌɪrɪˈvɜːsəbl//
Adjective
irreversibleCanonical form
1
Impossible to reverse, undo, or change back to a previous state or condition.
Climate change has caused irreversible damage to many ecosystems.
2
(of a process or action) Unable to be stopped or altered once started.
Once the chemical reaction begins, it is irreversible.