a. 不能挽回的, 不能复原的

[法] 不能恢复的, 无法挽救的, 不能弥补的

[ adj ]
impossible to recover or recoup or overcome
<adj.all>
an irretrievable lossirretrievable errors in judgment

Irretrievable \Ir`re*triev"a*ble\, a.
Not retrievable; irrecoverable; irreparable; as, an
irretrievable loss.

Syn: Irremediable; incurable; irrecoverable.