'Bitter' in the Bible

And they made their lives bitter with hard work with mortar and with bricks and with all [sorts] of work in the field--with all their work in which they ruthlessly enslaved them.

And they will eat the meat on this night; they will eat it fire-roasted and [with] unleavened bread on {bitter herbs}.

And they came to Marah, and they were not able to drink water from Marah because it was bitter. Therefore {it was named} Marah.