الملمس غير مستو بسبب الشق.

Because this is a nominal sentence in Arabic. In the present tense, Arabic usually leaves out the verb to be.

So:

• الملمس = the subject
• غير مستو = the predicate, describing the subject
• بسبب الشق = a phrase giving the reason

So Arabic does not need a separate word for is here.

الملمس means the texture, feel, or surface quality of something.

It comes from the root ل م س, which is related to touching. So this word is about how something feels or what its surface is like, not just the physical object itself.

In this sentence, it refers to the surface quality being uneven.

غير often works like not, non-, or un- in English.

In غير مستو, it means something like:

• not level
• uneven
• non-even

A useful thing to know is that غير is actually a noun in Arabic grammar, not just a simple negation particle. It usually forms an iḍāfa construction with the word after it.

So the full grammatical form is:

• غيرُ مستوٍ

where غيرُ is the main predicate, and مستوٍ is attached to it in an iḍāfa-like structure.

The underlying word is مستوٍ.

This is an adjective ending in a weak letter ي, and in the indefinite nominative or genitive form, that final ي is usually not written in the normal way. In fully vocalized Arabic, you would see:

• مستوٍ

But in ordinary unvowelled writing, this is often simplified to:

• مستو

So مستو is not a different word here; it is just the usual written appearance of مستوٍ when diacritics are omitted.

Because it is describing الملمس, and الملمس is masculine singular.

Arabic adjectives normally agree with the noun they describe in:

• gender
• number
• definiteness

So here the matching form is masculine singular.

If the noun were feminine, the adjective would change. For example, with a feminine singular noun, you would expect something like مستوية instead.

Both are possible, but the structure is different.

This sentence uses:

• الملمس غير مستو

A different version would be:

• الملمس ليس مستويًا

Both are natural, but they work differently:

• غير + adjective/noun is compact and very common in formal written Arabic
• ليس is a verb of negation, more like directly saying is not

So غير مستو is a neat descriptive phrase, while ليس مستويًا is a full negated verbal structure.

بسبب means because of or due to.

It is followed by a noun, not a full clause. So here:

• بسبب الشق = because of the crack

A useful comparison:

• بسبب الشق = because of the crack
• لأنّ هناك شقًا = because there is a crack

So:

• use بسبب before a noun phrase
• use لأنّ before a clause

Because ش is a sun letter.

The word is written:

• الشق

but pronounced more like:

• ash-shaqq

What happens is:

• the ل of الـ is not pronounced before a sun letter
• the next consonant is doubled instead

Also, the last consonant has a shadda:

• شَقّ

So the pronunciation has a doubled sh sound at the start and a doubled q sound at the end.

In fully vocalized MSA, it would be:

• الملمسُ غيرُ مستوٍ بسببِ الشقِّ

Breakdown:

• الملمسُ: nominative, because it is the subject
• غيرُ: nominative, because it is the predicate
• مستوٍ: genitive, because it follows غير in an iḍāfa-like construction
• بسببِ: genitive after the preposition بـ
• الشقِّ: genitive because it comes after بسبب

In everyday unvowelled text, these endings are usually not written, which is why the sentence looks simpler.

Yes. الملمس is often best understood as texture or feel, but depending on context, English may use words like:

• surface
• finish
• texture
• feel

So if the context is physical damage, an English speaker might naturally think of the surface being uneven. Arabic is still using الملمس to focus on the tactile or surface quality.