This is the 12705th most frequent Polish word.
nieodwracalne
Irreversible.
Used to describe the permanent effects of actions.
Skutki jego działań były nieodwracalne.
The consequences of his actions were irreversible.
Used to refer to a decision that cannot be changed once made.
Zrozumiał, że jego decyzja jest nieodwracalna.
He realized that his decision is irreversible.
Used in the context of events affecting long-term outcomes.