kono eiga ha kowakunakute, omosiroi desu.

は marks the topic of the sentence.

In この映画は怖くなくて、面白いです。, the topic is この映画 (this movie). After setting the topic, the sentence says two things about it:

• 怖くなくて = not scary
• 面白いです = interesting

So the structure is basically:

• As for this movie, it’s not scary and it’s interesting.

It is not marking the direct object here; it is introducing what the speaker is talking about.

この is a demonstrative determiner, meaning it must be followed by a noun.

So:

• この映画 = this movie

You cannot normally say この by itself as a noun. If you want to say this one, you would use これ instead.

Compare:

• この映画 = this movie
• これ = this / this one

Because 怖い is an い-adjective, and here it is being put into its negative te-form.

Step by step:

• dictionary form: 怖い = scary
• negative: 怖くない = not scary
• negative te-form: 怖くなくて

This form is used to connect it to what comes next.

So:

• 怖くなくて、面白いです
• not scary, and interesting

This is a very common pattern with い-adjectives:

• 高い → 高くなくて
• 難しい → 難しくなくて
• 寒い → 寒くなくて

Here, なくて is mainly being used to connect two descriptions.

So the sentence is giving two qualities of the same movie:

• it is not scary
• it is interesting

In many beginner sentences, 〜なくて can be understood as not ... and ...

Important note: 〜て / 〜なくて can sometimes also suggest a reason, like because it isn’t..., depending on context. But in this sentence, the most natural reading is simple connection:

• It’s not scary, and it’s interesting.

Because in Japanese, when you connect multiple adjectives, only the final part of the sentence usually carries the polite ending.

So:

• 怖くなくて、面白いです。

is natural.

The first adjective is changed into a connecting form, and the final adjective finishes the sentence politely.

It would be unnatural to say something like:

• 怖くなくてです、面白いです

The です belongs at the end of the whole statement.

Because 面白い is the last adjective, so it stays in its normal sentence-ending form.

• 面白いです = is interesting

You only use 〜くて when you want to connect that adjective to something after it.

For example:

• この映画は怖くなくて、面白くて、長いです。
• This movie is not scary, interesting, and long.

There, 面白くて is in the middle, so it connects to 長いです.

But in your sentence, 面白い is the final idea, so it does not need a connecting form.

No. 怖いじゃなくて is not standard Japanese.

That is because 怖い is an い-adjective, and い-adjectives make negatives like this:

• 怖い → 怖くない
• 怖くなくて

The pattern じゃない / じゃなくて is used with:

• nouns
• な-adjectives

Examples:

• 学生じゃなくて、先生です。
• 静かじゃなくて、にぎやかです。

But with い-adjectives, use 〜くない / 〜くなくて.

Yes. That is grammatically fine and very natural.

Compare:

• この映画は怖くないです。面白いです。

• Two separate statements.

• この映画は怖くなくて、面白いです。
• One sentence connecting the two ideas.

The connected version sounds a little smoother when you want to describe the movie with multiple qualities in one sentence.

Yes, you can say:

• この映画は怖くないですが、面白いです。

This is also natural, but the nuance is a little different.

• 怖くなくて、面白いです: simple linking of two qualities
• 怖くないですが、面白いです: can sound a bit more contrastive, like it’s not scary, but it is interesting

So 〜なくて is often more neutral for listing traits, while 〜ですが can feel more like contrast.

Because the topic この映画は is already established at the beginning, so it does not need to be repeated.

Japanese often leaves out repeated information when it is already clear.

So this:

• この映画は怖くなくて、面白いです。

already means:

• As for this movie, it’s not scary, and it’s interesting.

If you repeated the topic, it would usually sound unnecessary in a simple sentence like this.

The comma 、 helps readability and shows a small pause:

• この映画は怖くなくて、面白いです。

It is especially common when two parts are being connected.

However, punctuation in Japanese can be somewhat flexible, and you may also see:

• この映画は怖くなくて面白いです。

Both are acceptable. The comma just makes the structure easier to see for learners and readers.

Those spaces are usually only for learners or for special formatting.

Normal Japanese is typically written without spaces:

• この映画は怖くなくて、面白いです。

So if you see spaced writing like:

• この　映画　は　怖くなくて、　面白い　です。

it is just there to help beginners identify parts of the sentence more easily. It is not how Japanese is normally written in books, messages, or articles.