: requiring much time, effort, or attention : exacting a demanding job demanding customers.

What does really demanding mean?

When a person is described as demanding, it usually means that he or she has very high standards or is especially hard to satisfy. The word comes from the Old French demander, "to request or demand," by way of the Latin demandare, "entrust."

Does demanding mean difficult?

Making difficult or irksome demands on a person's resources, patience, energy, etc. Requiring much endurance, strength, or patience. The definition of demanding is requires a lot of effort, skill or attention.