digressive

of superficial relevance if any; "a digressive allusion to the day of the week"; "a tangential remark"

(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"