Adjective

• 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"