Not focused or concentrated; inattentive, distracted, or diffuse.
会議中に彼は散漫で、話に集中していなかった。
He was distracted during the meeting and not focused on the discussion.
勉強中にスマホをいじると注意が散漫になる。
Playing with your phone while studying makes you lose concentration.
文章が散漫だと、読者に伝わりにくい。
If writing is diffuse, it's hard for readers to understand.