'Hardest' in the Bible

And made their lives bitter with hard work, making building-material and bricks, and doing all sorts of work in the fields under the hardest conditions.

And they made their hearts like the hardest stone, so that they might not give ear to the law and the words which the Lord of armies had said by the earlier prophets: and there came great wrath from the Lord of armies.

And with our hands we do the hardest work: when they give us curses we give blessings, when we undergo punishment we take it quietly;

In which I put up with the hardest conditions, even prison chains, like one who has done a crime; but the word of God is not in chains.