'Hard' in the Bible

And when the queen of Sheba heard of the fame of Solomon, she came to prove Solomon with hard questions at Jerusalem, with a very great company, and camels that bare spices, and gold in abundance, and precious stones: and when she was come to Solomon, she communed with him of all that was in her heart.

“Your father made our yoke hard; now therefore lighten the hard service of your father and his heavy yoke which he put on us, and we will serve you.”

The young advisers with whom Rehoboam had grown up said to him, "Say this to these people who have said to you, 'Your father made us work hard, but now lighten our burden' -- say this to them: 'I am a lot harsher than my father!

If my father put a hard yoke on you, I will make it harder: my father gave you punishment with whips, but I will give you blows with snakes.

But gave them the answer put forward by the young men, saying, My father made your yoke hard, but I will make it harder; my father gave you punishment with whips, but I will give it with snakes.

They worked hard and made the repairs. They followed the measurements specified for God's temple and restored it.

And he took up arms against King Nebuchadnezzar, though he had made him take an oath by God; but he made his neck stiff and his heart hard, turning away from the Lord, the God of Israel.