digressive (
http://definr.com/digressive)
adj 1: of superficial relevance if any; "a digressive allusion to
the day of the week"; "a tangential remark [syn:
tangential]
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" [syn:
discursive,
excursive,
rambling]