Revisamos el defecto muy grave y el resultado negativo.

It can mean either one.

Revisamos is the 1st person plural form of revisar, and it has two possible values:

• present tense: we review / we check
• preterite (simple past): we reviewed / we checked

Spanish often relies on context to make this clear. On its own, Revisamos el defecto muy grave y el resultado negativo could be understood in either tense.

For example:

• Hoy revisamos el informe. = Today we review/check the report.
• Ayer revisamos el informe. = Yesterday we reviewed/checked the report.

Because Spanish often leaves out subject pronouns when they are not needed.

The ending -amos in revisamos already tells you the subject is we. So nosotros is usually unnecessary.

• Revisamos el defecto... = We review/reviewed the defect...
• Nosotros revisamos el defecto... is also possible, but it adds emphasis or contrast.

For example:

• Nosotros revisamos el defecto, no ellos. = We reviewed the defect, not them.

Because there are two separate nouns, and in Spanish each one normally keeps its own article.

So:

• el defecto
• el resultado

This is more natural than trying to use just one el for both.

In this sentence, y joins two full noun phrases:

• el defecto muy grave
• el resultado negativo

Leaving out the second el would sound incomplete or unnatural here.

Because in Spanish, descriptive adjectives usually come after the noun.

So:

• defecto grave = serious defect
• resultado negativo = negative result

This is one of the most common differences from English, where adjectives usually come before the noun.

Spanish can sometimes place adjectives before the noun, but that often changes the tone, emphasis, or style. The most neutral order here is the one in your sentence:

• el defecto muy grave
• el resultado negativo

Because muy is the word used before adjectives and adverbs.

Here, grave is an adjective, so you need:

• muy grave = very serious

Use mucho mainly with:

• nouns: mucho trabajo = a lot of work
• verbs: trabaja mucho = he/she works a lot

So:

• muy grave ✅
• mucho grave ❌

Because adjectives in Spanish agree with the noun, but not all adjectives change in the same way.

• defecto is masculine singular
• resultado is masculine singular

So both adjectives must match those nouns.

However:

1. grave is an adjective with the same form for masculine and feminine singular:

   • un defecto grave
   • una situación grave

2. negativo is an adjective that changes form:

   • resultado negativo = masculine singular
   • prueba negativa = feminine singular

So both adjectives agree correctly, but they belong to different adjective patterns.

It is related, but in everyday Spanish grave often means serious or severe.

So in this sentence, defecto muy grave is most naturally understood as something like:

• a very serious defect
• a very severe defect

Spanish grave is common in medical, technical, legal, and general contexts:

• un problema grave = a serious problem
• un error grave = a serious error

So yes, it is a related word, but in normal use it often corresponds to serious/severe more than the English adjective grave.

Not always. This is an important vocabulary point.

Spanish revisar often means:

• to check
• to inspect
• to review
• to examine

Depending on context, it may or may not match English revise.

For example:

• revisar un documento = to check/review a document
• revisar un coche = to inspect/check a car
• revisar un examen = to review/check an exam

So if you are an English speaker, it is best not to assume revisar only means revise in the English sense.

Yes, el grave defecto is possible, but it is not exactly the same in tone.

Compare:

• el defecto muy grave = neutral, descriptive, very common
• el grave defecto = possible, but more literary, emphatic, or stylistically marked

Also, muy grave adds the idea of very. If you say el grave defecto, you lose that exact intensifier.

So:

• el defecto muy grave = the very serious defect
• el grave defecto = the serious defect, with a somewhat different feel

The original version is the more straightforward and neutral one.

Because muy only appears if the speaker wants to intensify that adjective.

The sentence says:

• el defecto muy grave
• el resultado negativo

That means the speaker is emphasizing how serious the defect is, but not necessarily intensifying negativo.

If the speaker wanted to intensify both, they could say:

• Revisamos el defecto muy grave y el resultado muy negativo.

So the absence of muy before negativo does not mean anything is wrong grammatically. It just means only grave is being intensified here.