هذه مفاجأة جميلة.

Because مفاجأة is a feminine noun, and the demonstrative must match it.

• هذا = this for masculine
• هذه = this for feminine

Since مفاجأة ends in ة and is grammatically feminine, Arabic uses هذه.

So:

• هذا كتاب = this is a book
• هذه مفاجأة = this is a surprise

In the present tense, Arabic normally leaves out the verb to be.

So هذه مفاجأة جميلة literally looks like:

• this
  • surprise
    • beautiful

but it means:

• This is a beautiful surprise.

This is very common in Arabic nominal sentences.

Compare:

• البيت كبير = The house is big
• هذه مفاجأة جميلة = This is a beautiful surprise

If you want past or future, Arabic does use verbs:

• كانت هذه مفاجأة جميلة = This was a beautiful surprise

Because جميلة is an adjective describing مفاجأة, and Arabic adjectives must agree with the noun they describe.

They usually match in:

• gender
• number
• definiteness
• case

Here:

• مفاجأة = feminine singular
• جميلة = feminine singular adjective

So جميلة has the feminine ending ة to match مفاجأة.

Compare:

• كتاب جميل = a beautiful book
• مفاجأة جميلة = a beautiful surprise

In Arabic, adjectives normally come after the noun they describe.

So:

• مفاجأة جميلة = literally surprise beautiful

This is the normal Arabic order.

Compare:

• رجل طويل = a tall man
• سيارة سريعة = a fast car
• مفاجأة جميلة = a beautiful surprise

English usually puts the adjective first, but Arabic usually puts it after.

Because here they are indefinite:

• مفاجأة = a surprise
• جميلة = beautiful

So the phrase means a beautiful surprise, not the beautiful surprise.

In Arabic, if the noun is indefinite, the adjective is also indefinite:

• مفاجأة جميلة = a beautiful surprise
• المفاجأة الجميلة = the beautiful surprise

In this sentence, the whole meaning is: This is a beautiful surprise.

هذه is a demonstrative pronoun, meaning this.

It points to something near the speaker. In this sentence, it introduces what is being talked about:

• هذه = this
• مفاجأة جميلة = a beautiful surprise

So the structure is basically:

• هذه = subject/topic
• مفاجأة جميلة = predicate/comment

This kind of sentence is very common in Arabic.

It is pronounced approximately mufaaja'a or mufājaʔa.

A helpful breakdown:

• مُ = mu
• فا = faa
• جَ = ja
• أَ = a glottal stop + a
• ة = usually -a in pause

So the word has a clear hamza sound in it: مفاجأة.

That hamza means there is a little break in the voice, like a catch in the throat.

That is hamza (ء), which represents a glottal stop.

In مفاجأة, it separates the sounds, so you should not smooth the whole word into one uninterrupted flow.

Instead of something like mufaajaa, it is more like:

• mu-faa-ja-ʔa

The hamza is important because it is a real consonant in Arabic.

That ending is called tāʾ marbūṭa (ة).

It often marks feminine nouns and adjectives.

In pause, it is usually pronounced like -a:

• مفاجأة ≈ mufājaʔa
• جميلة ≈ jamīla

But when the word is connected grammatically, especially with case endings or in an iḍāfa, it can sound like t.

For example:

• مفاجأةٌ جميلةٌ
• مفاجأةُ اليومِ

So the written ة often sounds like a at the end of a phrase, but it can become t in connected speech or grammatical constructions.

In fully vowelled formal Arabic, it would be:

هٰذِهِ مُفَاجَأَةٌ جَمِيلَةٌ

The endings -ٌ on مفاجأةٌ and جميلةٌ are called tanwīn ḍamm and mark the indefinite nominative.

Why nominative? Because this is a nominal sentence, and the predicate here is nominative.

However, in normal reading and especially in pause, learners often hear:

هذه مفاجأة جميلة

without pronouncing those final case endings clearly.

Yes, absolutely.

It is a complete nominal sentence in Arabic.

It has:

• a demonstrative/topic: هذه
• a predicate: مفاجأة جميلة

So it fully means This is a beautiful surprise.

You do not need an extra pronoun or verb in the present tense.

Yes, but the meanings change.

• هذه مفاجأة = This is a surprise
• هذه جميلة = This is beautiful / She is beautiful depending on context
• هذه مفاجأة جميلة = This is a beautiful surprise

So the original sentence is more specific because جميلة describes مفاجأة, not just هذه by itself.

A simple breakdown is:

• هذه = this
• مفاجأة = surprise
• جميلة = beautiful

So the literal order is:

• this surprise beautiful

Natural English rearranges that as:

• This is a beautiful surprise.

This is a good example of how Arabic and English often use different word order while expressing the same idea.