Is there a neutral way of saying "deliberately"? I wrote a sentence which involved 故意 (gùyì; deliberately) and my teacher explained that 故意 is a negative word: you can't deliberately do something good using 故意.  (I won't reproduce that sentence, since it contains other errors.)

But in English, "deliberately" ("intentionally"; "on purpose") is not necessarily a bad thing.


  To help the students understand her, our teacher deliberately speaks slowly.


I might translate this to


  为了让学生明白她说的，我们的老师故意地说得慢。


but then we have the problem of 故意 being negative.  I'm not sure if 有意 has the same issue, but it seems very similar to 故意.

Question: Is there a neutral way of saying "deliberately"?
'故意' implying someone intend to do some bad things. If you want to say someone intend to do things specially. You can use '特意'. This word do not imply any bad or good intention. It only emphasize 'specially'. But in most of case, Chinese love to use it in positive senarios, like me.

为了让学生听得明白，我们老师特意把语速放慢。
在下班的路上，他特意绕路去医院看望母亲。