形容詞 excursive:

1. (of e.g. speech and writing) tending to depart from the main point or cover a wide range of subjects
   同義詞：digressive, discursive, rambling

ex.cur.sive

adj.（形容詞）
Of, given to, characterized by, or having the nature of digression.
離題的：具有、加以、賦以離題本質(zhì)的

【引伸】
excur.sively
adv.（副詞）
excur.siveness
n.（名詞）