Adjective
Incapable of being reversed or turned about or back; incapable of being made to run backward; as, an irreversible engine.
Incapable of being reversed, recalled, repealed, or annulled; as, an irreversible sentence or decree.
Source: Webster's dictionaryI believe we are on an irreversible trend toward more freedom and democracy - but that could change. Dan Quayle
It is hard to have patience with people who say 'There is no death' or 'Death doesn't matter.' There is death. And whatever is matters. And whatever happens has consequences, and it and they are irrevocable and irreversible. C. S. Lewis
If left unchecked, global change will create violent conflict, torrential storms, shrinking coastlines, and irreversible catastrophe. Valerie Jarrett
The mystery of the arrow of time comes down to this: Why were the conditions in the early universe set up in a particular way, in a configuration of low entropy that enabled all of the interesting and irreversible processes to come? Sean M. Carroll
I feel in the depths of my soul that it is the highest, most sacred, and most irreversible part of my obligation to preserve the union of these states, although it may cost me my life. Andrew Jackson
Describe, usually with regret, something that has already happenned and is irreversible. Indonesian Proverb