His errors were errors of unprofitableness, but never of viciousness.
He lamented the unprofitableness of good laws, by being in bad men's hands.
I do it with reluctance, and with a constant remembrance of my own unprofitableness.
O pardon my unprofitableness, and abuse of thy mercies, and my sluggish loss of precious time!
No man upon earth is more sensible of the unprofitableness ...