C2 adjective /ɪkˈskɜːsɪv/
excursive
abschweifend
Meaning
Tending to digress or wander; moving away from the main subject.
Example
His excursive lecture left the students confused about the main topic.
Sein abschweifender Vortrag ließ die Studenten über das Hauptthema verwirrt zurück.