Ekg says normal sinus rhythm, nonspecific st abnormality, abnormal ecg, what does this mean?

Common reading: "abnormal" because there are non-specific changes which are not specific enough to meet a true diagnosis, but not normal enough to say normal, so somewhat of a soft call or indecisive read, but very common and does not necessarily mean anything. The bottom line, the ECG findings need to be placed in the clinical context in which it was taken, and compared to previous and subsequent ECGs.