'Hard' in the Bible

Now the queen of Sheba heard of the fame of Solomon, and she came to Jerusalem to test Solomon with hard questions, with much wealth and camels, bearing spices and much gold and precious stones. And she came to Solomon and told him all that [was] {on her mind}.

"Your father made our yoke heavy. Now, therefore, lighten the hard service of your father and his heavy yoke which he put upon us, and we will serve you."