Is 海は青くないです less correct than 海は青ではない?


Is 海は青くないです less correct than 海は青ではない? I am just starting to learn and someone
said my basic sentence was not polite. I'm trying to practice conjugating
adjectives. My goal was to say ”The ocean is not blue".




Just adding some thoughts: I guess it would be correct 青ではない if you are using
it as a noun. Example:

好きなのは青ではなくて赤です [The thing I like is not blue, it is red]

But to me, just like the other person said, it also sounds off to say 海は青ではない。

Perhaps you could say 海は青色ではない. I am positive that saying it with 色 makes it
acceptable.

