Noah Webster's Dictionary (n.) The quality or state of being blameless; innocence.

Multi-Version Concordance Blamelessness (2 Occurrences) Job 27:5 Be it far from me that I should justify you; till I die I will not remove my blamelessness from me. (DBY) Job 31:6 (Let me be weighed in an even balance, and +God will take knowledge of my blamelessness;) (DBY)