You might have seen a pain scale in your doctor's office before. One common type shows a series of numbered cartoon faces moving from 0 (smiling and pain-free) to 10 (weeping in agony.) A doctor would ask a person in pain which face matched up with what they were feeling. They might seem simple.
In our day this might be more than one. For Israelite King Echov, one particular foreign wife, Isabel, was one too many. King David is said to have had eighteen wives and concubines, seven mentioned by name in the OT and the others mentioned in the oral tradition.
Moses had two wives. His Kushite wife was his half-sister, as was Sarah to Abraham. The pattern of Moses's family is identical to that of the rulers listed in Genesis 4, 5 and 11 and to that of Abraham's father Terah and Samuel's father Elkanah. One of the sons of Korah the Younger (Ishar's son) was named Elkanah.