Departing from the main subject; partaking of the nature of digression.
source: Webster 1913
adjective satellite
of superficial relevance if any
A digressive allusion to the day of the week. A tangential remark.
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.
