Definition

Noun (uncountable): The quality or state of being impossible to reverse, change, or return to a previous condition.

Usage Examples

• (The fact that climate change cannot be undone.)
• (The reaction cannot proceed backward.)
• (He acknowledged that the decision could not be changed.)

Advanced Usage

• In chemistry: Refers to a reaction that proceeds in only one direction and cannot be reversed under normal conditions.

  • The irreversibleness of the combustion process means fuel cannot be recovered from ash and gases. (The reaction is one-way.)

• In philosophy or ethics: Describes events or choices that have permanent consequences.

  • The irreversibleness of death shapes many cultural beliefs about life. (Death is a permanent state.)

Variants and Related Words

• Irreversible (adj): not able to be reversed.

  • The damage to the ecosystem is irreversible. (The damage cannot be undone.)

• Irreversibly (adv): in a way that cannot be reversed.

  • The glacier melted irreversibly. (The melting was permanent.)

• Reversibleness (n): the quality of being reversible (opposite meaning).

  • The reversibleness of the lock allows it to open from both sides. (It can be undone.)

Synonyms

• Permanence: the state of lasting forever without change.
• Irrevocability: the quality of being impossible to retract or change (often used for decisions or legal actions).
• Finality: the state of being finished or settled with no possibility of alteration.

Related Idioms

• No turning back: a situation where a decision or action cannot be reversed.

  • Once the contract is signed, there is no turning back. (The agreement is final.)

• Point of no return: the stage in a process where reversal is impossible.

  • The project has reached its point of no return; we must continue. (We cannot stop now.)

Phrasal Verbs

• Set in stone: to make something fixed and unchangeable.
  • The deadline is set in stone, so the irreversibleness of the schedule is clear. (The schedule cannot be changed.)