هاد المدخل آمن.

Yes. هاد is a Levantine Arabic way to say this. It corresponds to Modern Standard Arabic هذا.

A few useful notes:

• هاد is common in Levantine speech.
• In other Levantine areas, you may also hear هيدا or هادا.
• In everyday Levantine, هاد is often used with both masculine and feminine nouns.

So هاد المدخل = this entrance.

Because Arabic often leaves out the verb to be in the present tense.

So the sentence structure is simply:

• هاد المدخل = this entrance
• آمن = safe / secure

Together: This entrance is safe.

This is called a nominal sentence. In the present tense, Levantine usually does not say a separate word for is.

But in other tenses, you do use a verb, for example:

• كان آمن = was safe
• رح يكون آمن = will be safe

In Levantine, when a noun comes after this/that, it is very often definite, so you commonly get:

• هاد البيت = this house
• هاد المدخل = this entrance

So هاد المدخل is the normal pattern.

This is similar to Standard Arabic too, where you often get:

• هذا المدخل

For learners, a good rule is:

• after هاد, expect a definite noun most of the time.

A good approximation is:

• il-madkhal or el-madkhal

A few pronunciation tips:

• الـ in Levantine often sounds like il- or el-
• kh is the throaty sound in German Bach or Scottish loch
• stress is usually near the beginning: MAD-khal

Also, the word comes from the root دخل, related to entering. So مدخل literally means something like entrance / entryway.

Because here آمن is the predicate of the sentence, not just an adjective inside the noun phrase.

The structure is:

• هاد المدخل = the thing we are talking about
• آمن = what we are saying about it

So the sentence is literally like:

• this entrance — safe

That is how Arabic says This entrance is safe.

A useful contrast:

• هاد المدخل آمن = This entrance is safe
• المدخل الآمن = the safe entrance

In the second example, الآمن is directly modifying المدخل inside the noun phrase. In the original sentence, it is the predicate.

A good learner-friendly pronunciation is:

• aa-men or ʔaa-men

Tips:

• The first vowel is long: aa
• The word begins with a hamza, a small throat-stop, though in fast speech learners may hear it less clearly
• The last vowel may sound slightly different depending on speaker and region, sometimes closer to -men and sometimes closer to -min

Most importantly, do not pronounce it like English amen.

Here it is an adjective, meaning safe / secure.

That is important because the spelling آمن can also be a verb in other contexts, especially in Standard Arabic, where it can mean he believed.

In this sentence, though, the structure makes it clear that آمن is describing المدخل:

• هاد المدخل آمن = This entrance is safe

If it were the verb believed, the sentence would need a very different context and structure.

It can mean either, depending on context.

For a place like an entrance, building, or area, آمن can mean:

• safe
• secure
• not dangerous
• protected

So in English, the best translation depends on the situation:

• This entrance is safe
• This entrance is secure

Both are reasonable.

Yes, adjectives in Arabic normally agree with the noun.

Here:

• المدخل is masculine singular
• so آمن is also masculine singular

If the noun were feminine, you would normally use the feminine form:

• هاد البوابة آمنة = This gate is safe

So agreement is an important part of Arabic grammar.

For plurals, the system gets a bit more complex, especially with non-human nouns, but the basic idea is: the describing word usually has to agree with the noun.

Yes, depending on the region.

Two very common Levantine alternatives are:

• هالمدخل آمن
• هيدا المدخل آمن

Notes:

• هالـ is a very common Levantine way to say this + noun
• هيدا is especially common in Lebanese and much Syrian speech
• هاد is also a normal Levantine form, especially in Palestinian and Jordanian varieties, and is understood more broadly too

So all of these can be natural, but the most natural choice depends on which Levantine variety you want to speak.