מרוב מים, החימר נעשה רטוב מדי.

מרוב is made of:

• מ־ = from
• רוב = abundance, great amount, or most

So literally, מרוב means something like from too much of... or from an excess of...
In natural English, it often comes out as because of too much... or due to an excess of...

So in this sentence, מרוב מים is an idiomatic way to say that there was so much water that it caused the result.

Because מרוב adds the idea of excess.

• בגלל מים = because of water
• מרוב מים = because there was too much water

So מרוב is more specific. It suggests not just a cause, but an overly large amount that led to the result.

That makes it a very good fit with the rest of the sentence, which also has מדי (too).

מים is one of those Hebrew nouns that has a plural form but is used as a basic word for a substance.

A native English speaker often notices this quickly because English water looks singular, but Hebrew uses מים all the time for water.

A few useful points:

• מים is the normal word for water
• It is grammatically plural in form
• When it takes an adjective, the adjective is usually plural too:
  מים קרים = cold water

So even though it translates as singular in English, its Hebrew form is plural.

The prefix ה־ is the definite article, meaning the.

So:

• חימר = clay
• החימר = the clay

In this sentence, the speaker is talking about a specific clay being discussed, not clay in general, so החימר is natural.

Here, נעשה means became.

This is a very common learner question because the verb comes from the root ע-ש-ה, which is associated with doing/making. But in this form, נעשה can mean different things depending on context.

In this sentence:

• נעשה רטוב = became wet

So it is describing a change of state, not someone actively making the clay wet.

A useful comparison:

• העוגה נעשתה טעימה = the cake became tasty
• הבית נעשה גדול יותר = the house became bigger

Because נעשה focuses on change, while היה describes a state.

• החימר היה רטוב מדי = the clay was too wet
• החימר נעשה רטוב מדי = the clay became too wet

So the sentence is not just saying what the clay was like. It is saying that, because of too much water, it turned into that condition.

In Hebrew, מדי normally comes after the adjective or adverb it modifies.

So you say:

• רטוב מדי = too wet
• חם מדי = too hot
• מהר מדי = too fast

This is the standard word order.

English speakers often want to move too before the adjective, but in Hebrew מדי usually follows it.

They are related, but they are not used in exactly the same way.

• מדי is commonly used after adjectives and adverbs:
  רטוב מדי = too wet
  לאט מדי = too slowly

• יותר מדי is very common with nouns and amounts:
  יותר מדי מים = too much water
  יותר מדי אנשים = too many people

So in this sentence, the structure is perfectly natural:

• מרוב מים = because of too much water
• רטוב מדי = too wet

Because Hebrew adjectives agree with the noun they describe in gender and number.

Here, the noun is החימר, and חימר is masculine singular, so the adjective is also masculine singular:

• החימר רטוב = the clay is wet

If the noun were feminine singular, the adjective would change:

• האדמה רטובה = the soil/earth is wet

So רטוב matches החימר.

The phrase מרוב מים has been moved to the front of the sentence for emphasis. It sets up the cause first:

• מרוב מים, החימר נעשה רטוב מדי.

The comma marks a pause after that fronted phrase.

You could also put the cause later:

• החימר נעשה רטוב מדי מרוב מים.

That version is also understandable, but the original order puts more focus on the cause.

Yes, it is natural Hebrew. It sounds a bit neat and standard, especially with נעשה.

In everyday speech, many speakers might also say:

• החימר נהיה רטוב מדי מרוב מים
• בגלל יותר מדי מים, החימר נהיה רטוב מדי

So:

• נעשה can sound a bit more formal or neutral
• נהיה is often more conversational

But the original sentence is completely correct and idiomatic.