The teacher is easy to follow because they don’t insert unnecessary personal information.
"先生は余計な私情を挟まない方なので付き合いやすい"
- The teacher is easy to follow because they don’t insert unnecessary personal information.
- It’s easy to follow along with this teacher because they are dispassionate.
They give their lessons in a calm, dispassionate way.
- 冷静沈着にレッスンをしてくれる。
The teacher is easy to get along with since they are not dispassionate about what they do.
ご質問ありがとうございます。
「[先生](https://eikaiwa.dmm.com/uknow/questions/120859/)は余計な私情を挟まない方なので付き合いやすい」という文章でdispassionateを使いたいなら、英語の文章は「The teacher is easy to get along with since they are not dispassionate about what they do.」になります。
ご参考になれば幸いです。
アメリカ合衆国 
