'Bitter' 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 let your food that night be the flesh of the lamb, cooked with fire in the oven, together with unleavened bread and bitter-tasting plants.

And when they came to Marah, the water was no good for drinking, for the waters of Marah were bitter, which is why it was named Marah.