not good

Are these sentences correct:

[color=red]1-What is fascinating can sometimes be not good for some people.
[color=indigo]2-What is fascinating can sometimes be not good.
[color=blue]3-The plan was sort of not good.

Gratefully,
Navi.

You will no doubt find instances of sentences like #1 and #2 in use, but they do not seem like very polished English to me.

#3 is an informal sentence, and is OK in that capacity.

Hi Navi,

(1) and (2) suffer from unnatural word order. I suggest:

What is fascinating can sometimes not be good for some people. Or -

What is fascinating can sometimes be no good for some people

2-What is fascinating can sometimes not be good. Or - What is fascinating can sometimes be no good,

(3) could be better expressed as: The plan was not what you’d call good.

Alan