What Makes Writing Sound Childish? Moving Beyond “Mitai da” and “Sugoi”

When writing in Japanese, there are times when your grammar is correct, but the whole piece still feels a little immature.

One common reason is relying too much on overly convenient words.

Two especially common examples are:

「みたいだ」
and
「すごい」

Of course, these expressions are not bad.

They are natural in conversation.
They are easy to use.
They often communicate emotion quickly.

But when they appear again and again in writing, the result can sound vague, shallow, or childlike.

So what should you do instead?

The answer is not simply “use more difficult words.”

What really matters is making your meaning a little more precise.

In this article, we will look at why expressions like 「みたいだ」 and 「すごい」 can make writing sound childish, and how to move one step beyond them.

Why do 「mitai da」 and 「sugoi」 sound childish in writing?

There are two main reasons.

The first is that they are too broad.

Take 「すごい」 for example.

It can mean great, amazing, impressive, shocking, intense, strong, or simply “a lot.”

Because it can mean so many things, the reader may not know what exactly you want to say.

The second reason is that they sound strongly like spoken language.

「みたいだ」 is very natural in conversation, but in writing it can feel a little light or casual.

In explanations or opinion essays, expressions such as 「ようだ」, 「らしい」, or 「と思われる」 often fit better.

So the problem is not a lack of vocabulary.

The problem is often that the wording is too vague.

How does 「mitai da」 affect writing?

Look at these examples:

He looks very tired.
This town seems quieter than before.
This movie seems popular overseas too.

All of them make sense.

But as written Japanese, they feel a little conversational.

The important point is not that 「みたいだ」 must always be avoided.

Rather, in writing, it is better to choose an expression that matches the basis of your judgment.

That alone makes the sentence feel more organized.

Better alternatives to 「mitai da」

1 「ようだ」

This is the most basic and useful alternative.

He seems very tired.
This town seems quieter than before.

Compared with 「みたいだ」, 「ようだ」 sounds a little more formal and fits essays and explanatory writing more naturally.

If you are unsure, replacing 「みたいだ」 with 「ようだ」 is often a good first step.

2 「らしい」

This is useful when the statement is based on information you heard or on commonly shared knowledge.

This movie is said to be popular overseas too.
This summer is apparently going to be very hot.

But 「らしい」 suggests that the information is not based entirely on your own direct observation.

So when you are describing what you personally notice, 「ようだ」 may fit better.

3 「と思われる」

This works well in explanatory or opinion writing when you want to sound more objective.

This system seems to have room for improvement.
The impact of the aging population appears to be significant.

This expression is too formal for ordinary conversation, but very useful in writing.

It suggests not just a feeling, but a judgment reached through thought.

4 Sometimes, state it directly

In fact, you do not always need an uncertain expression.

For example:

He looks very tired.

Depending on the context, it may be more natural simply to write:

He is very tired.

In writing, too many expressions such as maybe, seems, probably, or perhaps can make the sentence weak.

When something can be written as an observable fact, it is often better to state it clearly.

Why is 「sugoi」 useful but risky?

「すごい」 is extremely useful.

Amazing scenery.
An amazing person.
Amazing effort.
I was really impressed.
It was really difficult.

In conversation, that may be enough.

But in writing, when it appears too often, the outline of the sentence becomes blurred.

The reader wants to know:

What exactly was impressive?
In what way?
To what degree?
Why did it matter?

When you reduce 「すごい」, your writing does not just sound more advanced.

It becomes easier to understand.

Better alternatives to 「sugoi」

1 If you want to express emotion, name the emotion

I thought the movie was amazing.

This sounds a little childish because the emotional content is unclear.

Try something more specific:

I was deeply moved by the movie.
The movie had a strong impact on me.
The movie made me think seriously.

With these expressions, the reader can see what kind of response you had.

2 If you want to show quality, describe the quality

He is an amazing teacher.

This is natural in speech, but in writing it is better to explain what makes him good.

He is a teacher whose explanations are very easy to understand.
He is highly trusted by his students.
He is knowledgeable and also careful in his guidance.

Once you show the basis of the evaluation, the sentence becomes much stronger.

3 If you want to express size or amount, choose a more precise word

There was amazing rain.
Amazing numbers of people gathered.

In writing, these are better expressed as:

There was heavy rain.
A very large number of people gathered.
A crowd filled the venue.

Once 「すごい」 disappears, the image becomes much clearer.

4 Instead of using 「sugoku」 for everything, choose a better adverb

It was really difficult.
I was really tired.
It is really important.

These are easy to use, but repeated use makes writing sound immature.

Depending on the sentence, you can try:

It was extremely difficult.
I was quite tired.
It is highly important.
It is particularly important.
It is truly important.

Of course, the answer is not to make everything sound stiff.

The best choice depends on the type of writing.

Mature writing has explanation, not just reaction

Compare these two examples.

This book was really interesting. I thought the way the main character thinks was amazing.

The meaning is understandable, but it sounds somewhat childish.

Now compare it with this:

I found the book engaging from beginning to end. In particular, I was impressed by the way the main character grew through failure.

The second one sounds more mature because it shows what was interesting and why.

Writing that sounds mature is not writing full of difficult vocabulary.

It is writing that explains one step beyond the first reaction.

A simple revision method you can use right away

When writing, you do not need to delete every 「みたいだ」 or 「すごい」 immediately.

It is fine to write naturally at first.

The important stage is revision.

When you find 「みたいだ」, ask yourself whether 「ようだ」, 「らしい」, 「と思われる」, or a direct statement would fit better.

When you find 「すごい」, ask yourself:

What exactly is amazing here?

Try adding just one more word of explanation.

That alone can change the quality of the writing.

Good writing is not created in one perfect first draft.

It becomes better when vague words are gradually made more precise.

Final examples

Sentences that can sound childish

This town seems more convenient than before. There is also an amazing shop near the station.
He seems really smart, and even the teacher said he is amazing.
This movie seems really popular.

Revised versions

This town appears to have become more convenient than before. A large commercial facility has also been built near the station.
He seems to understand things very quickly, and he also appears to be highly regarded by his teacher.
This movie seems to be attracting considerable popularity both in Japan and abroad.

When you compare them, the revised version does not simply sound harder.

It sounds clearer.

That is what makes writing look less childish.

Conclusion

「みたいだ」 and 「すごい」 are both convenient and natural expressions in conversation.

But in writing, relying on them too much can make your sentences sound vague and immature.

「みたいだ」 can often be replaced with 「ようだ」, 「らしい」, 「と思われる」, or even a direct statement.

「すごい」 can often be improved by making the meaning more specific:
moved, impressive, excellent, very, intense, significant, and so on.

That small change can make your writing much easier to read.

Good writing is not writing decorated with difficult words.

It is writing where your thoughts and observations are placed in a form the reader can clearly understand.

If you want to build a stronger feel for subtle Japanese nuance through real examples and practice questions, visit https://rapid-jt.com/ and explore how these expressions are actually used.