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Webster 1913 Edition

Adj.

Not capable of being recovered, regained, or remedied; irreparable;

as, an

irrecoverable

loss, debt, or injury

–

Irˊre-cov′er-a-ble-ness

Noun.

–

Irˊre-cov′er-a-bly

adv.

Adj.

[in and recoverable.]

Not to be recovered or repaired; as an irrecoverable loss.

That cannot be regained. Time past is irrecoverable.

That cannot be obtained by demand or suit; as a debt.

Not be remedied; as irrecoverable misery.

irrecoverable ‎(comparative more irrecoverable, superlative most irrecoverable)

Not recoverable or admitting of recovery; incapable of being recovered.
an irrecoverable debt
That cannot be recovered from or made good; irremediable.
an irrecoverable disease; irrecoverable danger

irrecoverable in The Century Dictionary, The Century Co., New York, 1911
irrecoverable in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913