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Webster 1913 Edition

Adj.

Incapable of being justly reproved; irreproachable; blameless; upright.

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Irˊre-prov′a-ble-ness

Noun.

–

Irˊre-prov′a-bly

adv.

irreprovable ‎(comparative more irreprovable, superlative most irreprovable)

Not reprovable; irreproachable.
- 1999, Charlotte Turner Smith and Elizabeth Kraft, The Young Philosopher, ISBN 0813109620, page 209:
  Would to God, Mrs. Glenmorris, your conduct has always been as irreprovable.