الشارع هادي الصبح.

Because Egyptian Arabic usually does not use a present-tense verb for to be in sentences like this.

So:

• الشارع هادي = The street is quiet

There is no separate word for is in the present tense here.

But in other tenses, you do use a verb:

• الشارع كان هادي الصبح = The street was quiet in the morning
• الشارع هيبقى هادي الصبح = The street will be quiet in the morning

So this kind of sentence is very normal in Arabic.

This is a very important difference.

Here, هادي is the predicate: it tells you something about the street.

• الشارع هادي = The street is quiet

If you said:

• الشارع الهادي

that would mean:

• the quiet street

So:

• الشارع هادي = a full sentence
• الشارع الهادي = just a noun phrase

A good rule:

• after the noun, if the adjective is part of the description inside the noun phrase, it usually matches definiteness
• if the adjective is the predicate in a sentence like this, it does not take ال

Yes, basically.

• هادئ is the more formal / Standard Arabic form
• هادي is the common Egyptian colloquial form

In everyday Egyptian speech, people usually say هادي.

So if you already know هادئ, think of هادي as the natural Egyptian equivalent in normal conversation.

In Egyptian Arabic, many time expressions can be used directly without a preposition.

So:

• الصبح can mean in the morning / in the morning time

That is very natural.

This is similar to how English sometimes drops extra words in time expressions:

• I’ll see you Monday
• I work nights

Arabic does this a lot with time words.

So in this sentence:

• الشارع هادي الصبح

the word الصبح is functioning like a time expression: in the morning.

In normal pronunciation, the ل in ال is not pronounced here, because ش is a sun letter.

So الشارع is pronounced more like:

• esh-shāreʿ or ish-shāreʿ

not:

• al-shāreʿ

What happens is:

• ال + شارع → the l sound disappears
• the sh sound gets doubled

So the beginning sounds like esh-sh...

Yes, it does agree with الشارع.

• شارع is a masculine singular noun
• so the adjective/predicate is also masculine singular: هادي

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

• المنطقة هادية الصبح = The area is quiet in the morning

So here:

• هادي = masculine
• هادية = feminine

In Egyptian Arabic, a very common way to negate this kind of sentence is with مش.

So:

• الشارع مش هادي الصبح = The street isn’t quiet in the morning

This is the normal everyday Egyptian pattern for negating nominal sentences.

Compare:

• الشارع هادي الصبح = affirmative
• الشارع مش هادي الصبح = negative

It is clearly Egyptian Arabic in style.

The main clues are:

• هادي instead of the more formal هادئ
• الصبح as a very natural colloquial time expression

A more Standard Arabic version might be:

• الشارع هادئ صباحًا
• الشارع هادئ في الصباح

So if you are learning Egyptian, الشارع هادي الصبح is exactly the kind of everyday phrasing you want to know.

This order is very natural and neutral:

• الشارع هادي الصبح

But Arabic is somewhat flexible with time expressions, especially in speech.

For example, you may also hear:

• الصبح الشارع هادي

This puts more emphasis on in the morning.

Still, the original order is probably the easiest and most natural version for a learner to use first:

• topic: الشارع
• description: هادي
• time: الصبح