digressive

形容词 digressive:

1. of superficial relevance if any
   同义词：tangential
2. (of e.g. speech and writing) tending to depart from the main point or cover a wide range of subjects
   同义词：discursive, excursive, rambling

di.gres.sive

adj.（形容词）
Characterized by digressions; rambling.
离题的：带离题性的；不着边际的

【引伸】
digres.sively
adv.（副词）
digres.siveness
n.（名词）