digressive

adjective

1. 1

   (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

2. 2

   of superficial relevance if any

   a digressive allusion to the day of the week

   a tangential remark