'Hard' in the Bible

I am sending you to them who are stubborn and obstinate children, and you shall say to them, ‘Thus says the Lord God.’

For thou art not sent to a people of a strange speech and of an hard language, but to the house of Israel;

Not to many people of a strange speech and of an hard language, whose words thou canst not understand. Surely, had I sent thee to them, they would have hearkened unto thee.

But the house of Israel will not hearken unto thee, for none of them will hearken unto me. For all the house of Israel are hard of forehead and stiff of heart.

Look, I have made your face as hard as their faces and your forehead as hard as their foreheads.

The people of the land have been acting cruelly, taking men's goods by force; they have been hard on the poor and those in need, and have done wrong to the man from a strange land.

"Son of Man, King Nebuchadnezzar of Babylon made his army work very hard to attack Tyre. They tore their hair out and rubbed their shoulders raw! Despite all of that work trying to capture Tyre, neither he nor his army got paid from Tyre for all that!

I have given him the land of Egypt as the reward for his hard work, because they were working for me, says the Lord.