هذا الحد.

A careful pronunciation is hādhā al-ḥadd.

A few helpful sound notes:

• ذ in هذا sounds like th in this
• ح in الحد is a stronger, deeper h than English h
• الـ is pronounced al- here
• حدّ ends with a doubled d sound: ḥadd

So it is hā-dhā al-ḥadd, not hāza or al-had.

In Arabic, the verb to be is usually omitted in the present tense when you are saying something like X is Y.

So Arabic can say:

• هذا الحد = This is the limit

with no separate word for is.

If you wanted past or future, Arabic would normally use a verb, such as forms of كان.

هذا is the demonstrative for a masculine singular noun: this.

The noun حدّ is masculine singular, so هذا is the correct match.

If the noun were feminine singular, you would usually use هذه instead.

الـ is the Arabic definite article, like the in English.

With a demonstrative such as هذا, Arabic normally uses a definite noun:

• هذا الحد = this limit / this boundary

That is why الحد has الـ.

If you said هذا حدٌّ, that would more naturally mean something like this is a limit or this is a boundary, with an indefinite noun.

It can be understood either way, depending on context.

• As a full sentence: This is the limit
• As a noun phrase: this limit

When it stands alone with a full stop, many learners will naturally read it as a complete nominal sentence. But the same words can also function as a phrase inside a larger sentence.

If treated as a stand-alone nominal sentence, a common fully vowelled form is:

هٰذَا الْحَدُّ

In normal reading at the end of a sentence, Arabic usually pauses, so the final short vowel is not clearly pronounced. That is why in everyday speech you would often just hear:

hādhā al-ḥadd

without a strong ending vowel.

Because ح is a moon letter, not a sun letter.

In Arabic, the ل of الـ is:

• pronounced before moon letters
• assimilated before sun letters

Since ح is a moon letter, you say:

• al-ḥadd

not something like aḥ-ḥadd.

Because everyday Arabic writing often leaves out short vowels and other diacritics, including shadda.

The word is really حَدّ with a doubled final consonant. So the more precise spelling is:

• الحدّ

But in ordinary unvowelled text, it is very common to write simply:

• الحد

Learners should still know that it is pronounced ḥadd, not ḥad.

هذا is a demonstrative pronoun, meaning this.

In هذا الحد, it points to a specific thing and identifies it as near the speaker. In simple learner terms, it functions like English this in this limit or this is the limit.

So the basic pattern is:

• هذا + definite noun

which is a very common Arabic structure.

In standard Modern Standard Arabic, the normal order is:

• هذا الحد

That is the standard form learners should use.

In some spoken dialects, you may hear noun + demonstrative patterns, but for MSA, هذا الحد is the correct and natural order.