What is it called when a male can't produces?

When a male is unable to produce sperm, the condition is called "asthenozoospermia" or "azoospermia" depending on the severity. Azoospermia refers specifically to the absence of sperm in the ejaculate, while asthenozoospermia indicates reduced sperm motility. Both conditions can affect male fertility and may require medical evaluation to determine underlying causes and potential treatments.