هذا حظ جيد.

It is a full sentence in Arabic.

This is a nominal sentence: a sentence built without a present-tense verb. Its basic structure is:

• هذا = the subject-like element
• حظ جيد = the predicate, describing what this is

So grammatically, it works like This is good luck in English, even though Arabic does not need a separate word for is here.

In Modern Standard Arabic, the verb to be is usually not expressed in the present tense when you are simply equating one thing with another.

So Arabic says:

• هذا حظ جيد literally: this good luck

but it means:

• This is good luck

If you wanted a past or future meaning, then Arabic would normally use a verb, such as كان for was.

هذا means this and is the masculine singular demonstrative.

In this sentence, it points to something near the speaker and functions as the first part of the sentence: this.

You will often see:

• هذا = this (masculine singular)
• هذه = this (feminine singular)

So هذا is the correct form here because the thing being referred to is treated as grammatically masculine.

That is a very good question.

There are two different patterns:

1. Demonstrative + definite noun phrase

   • هذا الكتاب
   • this book

2. Demonstrative + predicate sentence

   • هذا حظ جيد
   • this is good luck

In هذا الكتاب, الكتاب is the noun directly identified by هذا.

But in هذا حظ جيد, حظ جيد is not the noun attached directly to هذا in the same way. Instead, it is the predicate of the sentence: it tells you what this is.

That is why حظ can be indefinite here.

If you said هذا الحظ الجيد, that would mean something more like this good luck / this good fortune, as a noun phrase, not the same sentence structure.

Arabic nouns have grammatical gender, even when English nouns do not.

The noun حظ is grammatically masculine, so the demonstrative used with it is also masculine:

• هذا for masculine
• not هذه, which is feminine

This is about Arabic grammar, not biological gender or natural gender.

Because in Arabic, adjectives normally come after the noun they describe.

So:

• حظ جيد = good luck
• literally: luck good

This is the normal Arabic order:

• noun first
• adjective second

The adjective then agrees with the noun in gender, number, definiteness, and case.

Because it must agree with حظ.

Since حظ is:

• masculine
• singular
• indefinite

the adjective جيد must also be:

• masculine
• singular
• indefinite

This is standard adjective agreement in Arabic.

If the noun were feminine, you would expect a feminine adjective form instead.

The fully vowelled form is:

هذا حَظٌّ جَيِّدٌ

In careful grammatical Arabic:

• حَظٌّ takes -un because it is nominative
• جَيِّدٌ also takes -un because it matches the noun and is part of the nominative predicate

هذا itself does not take tanwīn here.

In normal everyday writing, these short vowels are usually omitted, so you usually just see:

هذا حظ جيد

It is pronounced approximately ḥaẓẓ.

A few notes:

• ح is a deeper, throatier sound than English h
• ظ is an emphatic consonant; in modern pronunciation it is often close to a dark or emphatic z
• the final consonant is doubled in careful pronunciation because the word is underlyingly حَظّ

So the word is short, but the sounds are not easy for English speakers at first.

A fuller pronunciation of the whole sentence, with case endings, is:

hādhā ḥaẓẓun jayyidun

In pause, many speakers would pronounce it more like:

hādhā ḥaẓẓ jayyid

Not usually.

هذا حظ جيد means that something is good luck, or that something counts as a lucky event. It is a statement.

To wish someone Good luck!, Arabic more often uses expressions such as:

• حظًّا سعيدًا!
• بالتوفيق!

So this sentence is grammatically useful, but it is not the most common formula for encouraging someone before a test, interview, and so on.

A simple breakdown is:

• هذا = demonstrative, functioning as the topic/subject of the sentence
• حظ = noun, luck
• جيد = adjective modifying حظ

So حظ جيد forms a noun phrase meaning good luck, and that whole phrase acts as the predicate of the sentence.

You can think of it as:

• هذا = this
• حظ جيد = good luck

Together: This is good luck.