in all conscience

[…] half a dozen fools are, in all conscience, as many as you should require; […]

c. 1703-20, “A Letter to a Very Young Lady on Her Marriage”, in Thomas Sheridan, John Nichols, John Boyle, Patrick Delany, John Hawkesworth, Deane Swift, William Bowyer, John Birch, George Faulkner, editors, The Works of the Rev. Jonathan Swift, volume 5, Jonathan Swift

He needed every penny of profit the Sofala could make. Little enough it was, in all conscience!

1902, Joseph Conrad, The End of the Tether

It would seem as if the touch of a democratic and anarchical independence had paralysed improvement, which was, in all conscience, slow enough, even in the viceregal times.

2014, Clements R. Markham, Cuzco and Lima, page 285

But could you, in all conscience, deprive these good people, who are, after all, trying to do their best, of meaningful employment, of earning their livelihoods?

2014, Belva Boroditsky Thomas, The Longest Adventure, page 201

There was a clear sectarian bias in the proposition that Christian groups or churches were being funded from abroad and no professional news organization or editor could in all conscience let such writings pass for news.

2015, Wendy Doniger, Martha C. Nussbaum, Pluralism and Democracy in India