Do you mean irreversible change? If so it means "It can not be changed".
no
reversable
IRREVERSIBLE
irreversible change.
irreversible
irreversible change
Burning something is irreversible.
Rusting is an irreversible process.
The antonym of irreversible would be reversible.
irreversible
Irreversible
of course its irreversible because once you have cooked the popcorn you cannot turn it back into what it was and originally they were small grains of corn