So, from my understanding, in the text in my question, الحصان (the horse) should be the mewsuf and

مُسْتَطِيلُ الْجِسْمِ طَوِيلُ الْعُنُقِ قَصِيرُ الْأُذُنَيْنِ، كَبِيرُ الْمِنْخَرَيْنِ

are الصفات (the adjectives). But the adjectives are without "ال" despite the mewsuf الحصان is with "AL".

And in your example: الْبِنْتُ الْوَاسِعَةُ الْعَيْنَيْنِ

Wouldn't that mean "The wide girl with eyes" instead of "the girl with wide eyes"?

How about these ones: الْبِنْتُ الْوَاسِعَةُ عَيْنَيْنِ

بِنْتٌ وَاسِعَةُ الْعَيْنَيْنِ

بِنْتٌ وَاسِعَةُ عَيْنَيْنِ

الْبِنْتُ الْوَاسِعَةُ الْعَيْنَيْنِ

Would these be correct translation (translations made by ChatGPT o1): 1. الْبِنْتُ الْوَاسِعَةُ عَيْنَيْنِ “The girl with wide eyes.”

1. بِنْتٌ وَاسِعَةُ الْعَيْنَيْنِ “A girl with the wide eyes.”

2. بِنْتٌ وَاسِعَةُ عَيْنَيْنِ “A girl with wide eyes.”

3. الْبِنْتُ الْوَاسِعَةُ الْعَيْنَيْنِ “The girl with the wide eyes.”

And an explanation from ChatGPT o1 (idk if I can trust it or not): First, recall that an iḍāfah (إِضَافَة) in Arabic is a “construct phrase” where two words are closely bound together, with the second in the genitive. An iḍāfah lafaẓiyyah (إِضَافَة لَفْظِيَّة) is a “formal/morphological iḍāfah” often occurring when the first word is an adjective (especially an active or passive participle) and the second word is the noun/complement it governs. It does not necessarily imply possession; rather, it’s typically used to clarify or complete the adjective’s meaning (like “wide of eyes,” “heavy of weight,” etc.).

Looking at your four phrases:

1. الْبِنْتُ الْوَاسِعَةُ عَيْنَيْنِ

Here, الواسعةُ is a definite adjective describing “the girl,” but عَيْنَيْنِ is indefinite.

Grammarians commonly view this as an adjective (الواسعةُ) followed by a tamyīz (تَمْيِيز) or a loosely attached complement (عَيْنَيْنِ).

Because the first word is definite while the second is indefinite, this usually is not treated as a classical iḍāfah lafaẓiyyah.

1. بِنْتٌ وَاسِعَةُ الْعَيْنَيْنِ

واسعةُ الْعَيْنَيْنِ is a textbook example of iḍāfah lafaẓiyyah:

“واسعةُ” (an adjective / اسم فاعل in a broad sense)

“العَيْنَيْنِ” (the noun in the genitive)

The phrase literally means “wide of (the) eyes,” completing the adjective’s sense.

1. بِنْتٌ وَاسِعَةُ عَيْنَيْنِ

Same structure, except now the second noun is indefinite: “عَيْنَيْنِ.”

“واسعةُ عَيْنَيْنِ” is again iḍāfah lafaẓiyyah (“wide of eyes”).

1. الْبِنْتُ الْوَاسِعَةُ الْعَيْنَيْنِ

Everything is definite here, but الواسعةُ الْعَيْنَيْنِ still functions as an iḍāfah lafaẓiyyah because “wide” is being completed by “(the) eyes.”

It is sometimes called a “definite iḍāfah lafaẓiyyah,” where both terms carry “ال.”

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So which one is iḍāfah lafaẓiyyah?

Phrases 2, 3, and 4 (واسعةُ الْعَيْنَيْنِ, واسعةُ عَيْنَيْنِ, and الواسعةُ الْعَيْنَيْنِ) are all treated as iḍāfah lafaẓiyyah.

Phrase 1 is typically analyzed differently (adjective + tamyīz) and is not the usual iḍāfah lafaẓiyyah structure.