irreversible
1. [ adjective ] impossible to reverse or be reversed
Examples:

"irreversible momentum toward revolution"

Related terms: reversible permanent
2. [ adjective ] impossible to reverse or undo
Examples:

"an irreversible decree"

Related terms: irrevocable
Similar spelling:   irreversibly
  irrepressible
  irreversibility
  irreverent
  irreproducible
  irreverence
  irreverently
  irreparable
  irreproachable