1. of superficial relevance if any;

"a digressive allusion to the day of the week"

"a tangential remark"

2. (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"