Ultrasound for enlarged uterus: uterus normal size but both ovaries are enlarged with multiple nonspecific cysts. what does nonspecific mean?

"Nonspecific": means that, based on the ultrasound, there is no specific cause that can be attributed to the cysts. There are a number of potential causes for ovarian cysts, there is nothing about their ultrasound appearance that enables the radiologist to make a a definite diagnosis as to what is causing them.

Unknown significance: "Nonspecific" is a fancy way to say we (radiologists) can't come up with a firm diagnosis based on that one study. Often your primary doctor can make your case more clear to you. For most findings that are likely to be really serious, a specific list of possibilites are put in the report. Without such a "differential diagnosis" it MAY imply less importance. Ask your regular doctor.