السلاح خطير.

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

So السلاح خطير is literally the weapon dangerous, but it means The weapon is dangerous.

This kind of sentence is called a nominal sentence. In the present tense, Arabic usually does not say is/are.

• السلاح خطير = The weapon is dangerous
• In the past, you would add a verb such as كان: كان السلاح خطير = The weapon was dangerous

This is true in both Standard Arabic and Levantine.

الـ is the Arabic definite article, meaning the.

So:

• سلاح = a weapon / weapon
• السلاح = the weapon

In this word, the ل of الـ is not fully pronounced, because س is a sun letter. That means the l sound assimilates to the next consonant.

So although it is written السلاح, it is pronounced roughly like:

• Standard Arabic: as-silāḥ
• Levantine: often something like is-slaaḥ or es-slaaḥ, depending on region

The spelling stays ال even though the pronunciation changes.

Because خطير here is not part of the noun phrase the dangerous weapon. It is the predicate of the sentence: dangerous.

So:

• السلاح خطير = The weapon is dangerous
• السلاح الخطير = the dangerous weapon

This is a very important difference.

When an adjective directly describes a noun inside a noun phrase, it usually matches the noun in definiteness:

• سلاح خطير = a dangerous weapon
• السلاح الخطير = the dangerous weapon

But in السلاح خطير, خطير is the second part of the sentence, not an adjective inside the noun phrase.

Grammatically, السلاح is singular: the weapon.

But Arabic often uses a definite singular noun to speak about something generically, meaning a whole category or concept. So depending on context, السلاح خطير can mean:

• The weapon is dangerous — a specific weapon
• Weaponry is dangerous / Weapons are dangerous — a general statement

Arabic and English do not always use singular and plural in exactly the same way for generic meaning.

A careful Standard Arabic pronunciation is:

as-silāḥ khaṭīr

A Levantine pronunciation may sound more like:

is-slaaḥ khaṭīr or es-slaaḥ khaṭīr

A few sound notes:

• خ in خطير is like the ch in German Bach or Scottish loch
• ط is an emphatic t, heavier and farther back than English t
• ح at the end of سلاح is a breathy throat sound, stronger than ordinary h

If those consonants are hard at first, that is completely normal for English speakers.

It works in both.

The written sentence السلاح خطير looks neutral and completely acceptable. A Levantine speaker would understand it immediately, and could also say it in everyday speech.

What changes most is the pronunciation, not the basic structure:

• Standard Arabic: as-silāḥ khaṭīr
• Levantine: often is-slaaḥ khaṭīr / es-slaaḥ khaṭīr

Also, Levantine does not use the full case endings that Standard Arabic has.

Because السلاح is grammatically masculine singular, and the predicate adjective matches it.

So:

• السلاح خطير = masculine singular
• السيارة خطيرة = feminine singular, The car is dangerous

The masculine form is خطير and the feminine form is خطيرة.

This agreement pattern is very common in Arabic.

It would be:

السِّلاحُ خَطيرٌ

Those final vowels are case endings:

• السِّلاحُ ends in -u
• خَطيرٌ ends in -un

In normal everyday writing, these are usually not written. In Levantine speech, they are not pronounced at all.

So for a learner of Levantine, the unvowelled form السلاح خطير is exactly what you would usually see.