القرار مهم.

Because Arabic usually leaves out the present-tense to be in simple statements like this.

So القرار مهم literally looks like the decision important, but it means the decision is important.

This is very normal in both Egyptian Arabic and Modern Standard Arabic.

For comparison:

• القرار مهم = The decision is important
• القرار كان مهم in Egyptian = The decision was important

Because القرار is the subject, the decision, while مهم is the predicate, important.

In a sentence like this, the predicate is usually indefinite, so it does not take الـ.

Compare these three patterns:

• قرار مهم = an important decision
• القرار مهم = the decision is important
• القرار المهم = the important decision

So if you add الـ to مهم, you change the structure completely.

A common Egyptian pronunciation is:

el-ʔarār mohemm

A few details:

• الـ is usually pronounced el- in Egyptian
• ق is often pronounced as a glottal stop ʔ in everyday Cairene Egyptian
• مهم is commonly pronounced mohemm

You may also hear a more careful or formal pronunciation closer to:

al-qarār muhimm

Both are useful to recognize.

Yes.

In القرار, the ل is pronounced because ق is a moon letter, not a sun letter.

So in Egyptian you get:

• el-ʔarār or el-qarār

Not something like:

• eʔ-ʔarār

This is different from words with sun letters, where the ل is not heard, such as الشمس, pronounced esh-shams.

It works in both.

The wording القرار مهم is very neutral and standard-looking, so it fits Modern Standard Arabic perfectly. Egyptians also use the same basic wording, especially in clear or semi-formal speech.

What changes most is the pronunciation:

• More formal: al-qarār muhimm
• Egyptian everyday speech: el-ʔarār mohemm

So the structure is shared, even if the sound changes.

Yes. مهم is an adjective meaning important, but in this sentence it is being used as the predicate.

That means it is not directly attached to the noun as part of one noun phrase. Instead, it is saying something about the noun.

Compare:

• قرار مهم = adjective directly describing the noun
• القرار مهم = adjective used as the predicate of the sentence

English does this too:

• an important decision
• the decision is important

Arabic uses the same adjective in both roles.

Not as the normal, neutral version.

For a basic statement, القرار مهم is the natural order.

Putting مهم first can sound marked, poetic, or strongly emphatic, rather than like the ordinary everyday sentence a learner usually wants.

So as a beginner, it is best to stick with:

• القرار مهم

The usual Egyptian negative is:

القرار مش مهم

This means The decision is not important.

A useful comparison:

• القرار مهم = The decision is important
• القرار مش مهم = The decision is not important

In more formal Arabic, you might also see:

• القرار غير مهم

But for everyday Egyptian, مش is the form to remember.

Yes. It agrees with the noun.

Here, قرار is masculine singular, so مهم is masculine singular too.

For example:

• القرار مهم = masculine singular
• الخطة مهمة = feminine singular

So if the noun changes, the adjective may change too.

For this sentence, the important thing to remember is:

• قرار is masculine
• therefore مهم is the correct form here