indefensibleness

The indefensibleness of the indiscriminate lesson giving consists in the fact that it is not the load but the harness that is too heavy.

The High School Failures A Study of the School Records of Pupils Failing in Academic or Commercial High School Subjects Francis P. Obrien

It was characteristic that, with all her debating, she was never troubled by the question whether the indefensibleness of her marriage did not include the fact that she had accepted Grandcourt solely as a man whom it was convenient for her to marry, not in the least as one to whom she would be binding herself in duty.

Daniel Deronda George Eliot 1849

As Redclyffe gave vent to this doctrine, which was not naturally his, but which had been the inculcation of a life, hitherto devoted to politics, he was surprised to find how strongly sensible he became of the ugliness and indefensibleness of what he said.

Doctor Grimshawe's Secret — a Romance Nathaniel Hawthorne 1834