الحاشية واسعة.

Because Arabic often uses a nominal sentence in the present tense.

So الحاشية واسعة literally looks like:

• الحاشية = the margin
• واسعة = wide

But the natural English meaning is The margin is wide.

In present-tense Arabic, is / am / are is usually not stated.
If you want past or future, Arabic does use verbs, for example:

• كانت الحاشية واسعة = The margin was wide.
• ستكون الحاشية واسعة = The margin will be wide.

In Arabic, adjectives normally come after the noun they describe.

So:

• الحاشية الواسعة = the wide margin

This is different from English, where adjectives usually come before the noun.

In your sentence, though, واسعة is not just an adjective inside a noun phrase. It is the predicate of the sentence:

• الحاشية = the subject
• واسعة = the predicate

So the whole sentence means The margin is wide.

Because الحاشية is a feminine noun, and Arabic adjectives must agree with the noun in:

• gender
• number
• definiteness (when the adjective is directly modifying the noun)

Here, الحاشية is feminine, so the predicate adjective is also feminine:

• masculine: واسع
• feminine: واسعة

The ـة at the end is a common feminine marker.

This is a very common question.

In الحاشية واسعة, واسعة is the predicate of the sentence, not an attributive adjective directly attached to the noun. Predicate adjectives are normally indefinite, so they do not take ال.

So:

• الحاشية واسعة = The margin is wide.
  
  • sentence
  • واسعة is a predicate

But:

• الحاشية الواسعة = the wide margin
  
  • noun phrase
  • الواسعة directly describes الحاشية

That contrast is very important:

• الحاشية واسعة = The margin is wide.
• الحاشية الواسعة = the wide margin.

A careful MSA-style pronunciation would be approximately:

• الحاشية = al-ḥāshiya
• واسعة = wāsiʿa

A few notes:

• ḥ in ḥāshiya is a strong, breathy ح, not the ordinary English h.
• ʿ in wāsiʿa represents ع, a sound that does not exist in English.
• The long ā means the vowel is held a little longer.

If you are pausing at the end of the sentence, many speakers will pronounce the final ة like -a, so:

• الحاشية واسعة → al-ḥāshiya wāsiʿa

The ة is called tāʾ marbūṭa.

In words like these, it usually marks a feminine noun or adjective:

• الحاشية
• واسعة

In normal pause, it is usually pronounced like -a.
If the word is followed closely in connected speech with case endings, it can sound more like -tun / -tan / -tin or -tu / -ta / -ti depending on the context.

So for a learner, the main takeaway is:

• ة often signals feminine
• at the end of a sentence, it is usually heard as -a

In fully vocalized formal Arabic, it would usually be:

• الحاشيةُ واسعةٌ

Both words are in the nominative:

• الحاشيةُ = the subject (mubtadaʾ)
• واسعةٌ = the predicate (khabar)

In everyday reading and speech, these case endings are often not pronounced, especially outside very formal contexts, so you will often just see:

• الحاشية واسعة

It is a nominal sentence (جملة اسمية).

Its two main parts are:

• الحاشية = mubtadaʾ (the topic/subject)
• واسعة = khabar (the predicate/comment)

So the structure is:

• [subject] + [predicate]
• الحاشية + واسعة

This is one of the most basic and common sentence patterns in Arabic.

They look similar, but they are grammatically different.

1. الحاشية واسعة

   • a full sentence
   • means The margin is wide

2. الحاشية الواسعة

   • a noun phrase
   • means the wide margin

A useful way to remember this:

• If the second word does not have ال, it may be the predicate of a sentence.
• If the second word does have ال and matches the noun, it is likely an adjective directly modifying the noun.

Yes, Arabic can sometimes change word order for style or emphasis, but the basic learner-friendly order here is:

• الحاشية واسعة

That is the clearest and most neutral form.

You may sometimes see more advanced or literary rearrangements, but for standard early learning, it is best to understand and use:

• subject first
• predicate second

So this sentence is a very normal model for beginners.

واسعة comes from the root و س ع, which has to do with width, spaciousness, or largeness.

Related forms include:

• واسع = wide / spacious
• واسعة = wide / spacious (feminine)
• سعة = width, capacity, spaciousness

Recognizing roots can help you connect related vocabulary more easily as your Arabic grows.