المفهوم واضح.

In Arabic, the present tense of to be is usually not written or spoken in simple sentences like this. So:

• المفهوم واضح literally looks like the concept clear but means the concept is clear

This is called a nominal sentence in Arabic.
If you wanted was, will be, and so on, Arabic would use a verb, but for the present tense it is normally omitted.

This is a standard nominal sentence with two parts:

• المفهوم = the subject (mubtadaʾ)
• واضح = the predicate (khabar)

So the structure is:

• المفهوم → what you are talking about
• واضح → what you are saying about it

In English, you need is between them. In Arabic, you usually do not.

المفهوم is the specific thing being talked about: the concept. That is why it has الـ.

But واضح here is the predicate, not an adjective directly attached inside a noun phrase. It is saying something about the concept:

• المفهوم واضح = The concept is clear

If you said:

• المفهوم الواضح

that would mean the clear concept, where واضح is now an adjective modifying the noun directly. In that case, it would also take الـ to match the noun.

So:

• المفهوم واضح = The concept is clear
• المفهوم الواضح = The clear concept

It is originally an adjective meaning clear. But in this sentence it functions as the predicate of the nominal sentence.

So it is still an adjective in form and meaning, but grammatically it is the khabar.

That is very common in Arabic:

• البيت كبير = The house is big
• الجو جميل = The weather is nice
• المفهوم واضح = The concept is clear

Yes. In fully inflected Modern Standard Arabic, you would write:

• المفهومُ واضحٌ

with:

• المفهومُ in the nominative
• واضحٌ also in the nominative

This is because in a basic nominal sentence, both the mubtadaʾ and the khabar are normally nominative.

In normal everyday writing, those short vowel endings are usually omitted, so you usually just see:

• المفهوم واضح

It is pronounced approximately:

• al-mafhūm

A rough breakdown:

• الـ = al-
• مفهوم = maf-hūm

Notes:

• The fh sequence means the f and h are separate sounds.
• The ū is a long vowel, like a long oo sound.

So the full sentence is approximately:

• al-mafhūmu wāḍiḥun in careful full pronunciation with case endings
• al-mafhūm wāḍiḥ in ordinary pause-style pronunciation

المفهوم comes from the root:

• ف هـ م
• f-h-m

This root is related to understanding.

A very common verb from this root is:

• فَهِمَ = he understood

مفهوم is on a pattern that often gives a passive participle or something like that which is understood. Depending on context, مفهوم can mean things like:

• understood
• understandable
• concept
• meaning / sense

In your sentence, it is being used as a noun: the concept.

Yes, مفهوم can sometimes mean understood or understandable, depending on context.

For example:

• هذا غير مفهوم = This is not understood / not understandable / unclear

But in المفهوم واضح, المفهوم is most naturally read as a noun: the concept. Then واضح describes it.

So here the structure is:

• المفهوم = the concept
• واضح = clear

Context usually tells you which meaning of مفهوم is intended.

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

So if you want to say the clear concept, you say:

• المفهوم الواضح

not the equivalent of واضح المفهوم in normal basic usage.

In your sentence, though, واضح is not just an adjective inside the noun phrase; it is the predicate of the whole sentence:

• المفهوم واضح = The concept is clear

So Arabic still places the describing word after the noun, but the grammar is slightly different from a noun-plus-adjective phrase.

Not if you want the simple meaning The concept is clear.

The normal neutral order is:

• المفهوم واضح

You may sometimes see different word orders in more literary or emphatic styles, but for a learner, the standard sentence to use is:

• المفهوم واضح

Also remember:

• المفهوم الواضح = the clear concept
• المفهوم واضح = the concept is clear

So changing the structure changes the meaning.

Yes. Arabic predicates and adjectives usually agree in gender and number with the noun they refer to.

Here:

• المفهوم is masculine singular
• so واضح is also masculine singular

Compare:

• الفكرة واضحة = The idea is clear
  because الفكرة is feminine singular

• المفاهيم واضحة = The concepts are clear
  because المفاهيم is plural

So the form واضح matches المفهوم.

If the noun were feminine, واضح would become واضحة.

Example:

• الفكرة واضحة = The idea is clear

So the change is:

• masculine singular: واضح
• feminine singular: واضحة

This is a very important agreement pattern in Arabic.

Both are nominal sentences, but they have different subjects:

• المفهوم واضح = The concept is clear
• هذا واضح = This is clear

So the grammar is similar, but the subject changes:

• المفهوم = a definite noun
• هذا = a demonstrative pronoun (this)

This is useful because once you understand one nominal sentence, many others work the same way.

Yes. المفهوم واضح is completely natural in Modern Standard Arabic.

It is short, formal, and straightforward, so it works well in:

• writing
• teaching
• explanations
• presentations
• news or academic contexts

In spoken dialects, people may use similar wording, though pronunciation and exact phrasing can vary.