Passing from one thing to another; ranging over a wide field; roving; digressive; desultory.
source: Webster 1913
adjective satellite
proceeding to a conclusion by reason or argument rather than intuition
source: WordNet 3.0
(of e.g. speech and writing) tending to depart from the main point or cover a wide range of subjects
Amusingly digressive with satirical thrusts at women's fashions among other things. A rambling discursive book. His excursive remarks. A rambling speech about this and that.