looks not easy, seems not easy

Question

Are these sentences correct?

1. It looks not easy.
2. It seems not easy.

Or do I need to say like these?

1. It doesn't look easy.
2. It doesn't seem easy.

Answer 1

It looks not easy.
It seems not easy.

... are grammatically correct but would sound rather odd. It is not recommended.

It doesn't look easy.
It doesn't seem easy.

... are grammatically correct and sound fine. This is how normal speech is and you should go with this.