I feel not very well这句话对不对？

I feel not very well是错的
应该为I don't feel very well.
我身体感觉不是很好。
I feel very well.是对的
我感觉身体很好。

希望可以帮到你，谢谢~！

对 两个都对

不是很好的英语，正确的说法是

I do not feel very well.

或者
I'm not feeling (very) well.这里一般不说very

很少听人说I feel very well.

一般都说I feel great. Wonderful.

两个看上去都没有什么问题，但是两个都说不通。
“I don't feel very well.”更好些，而“I'm not feeling very well.”更符合英语的使用习惯，二者有轻微的差别。
“I'm feeling very well.”更通顺。