هذا التصرف سيئ.

• هذا = this
• التصرف = behavior, conduct, action, or way of acting
• سيئ = bad, wrong, poor, depending on context

So the whole sentence means something like This behavior is bad or This action is wrong.

Because التصرف is a masculine noun in Arabic.

• هذا is the demonstrative for this with a masculine singular noun
• هذه is used with a feminine singular noun

So:

• هذا التصرف = this behavior
• هذه الفكرة = this idea

Even if the English translation uses a word like behavior, which does not have grammatical gender in English, the Arabic noun still has grammatical gender, and تصرف is masculine.

This is a very common pattern in Arabic.

In English, we say:

• this behavior

In Arabic, the normal structure is:

• هذا التصرف
• literally: this the-behavior

When a demonstrative like هذا comes before a noun, that noun is usually definite, so it takes الـ.

This is not strange in Arabic; it is the standard way to say this + noun.

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

In English, you need is:

• This behavior is bad

In Arabic, present-tense to be is usually not stated:

• هذا التصرف سيئ

So the sentence is complete even without a word meaning is.

In standard Arabic, that would usually sound unnecessary or unnatural in a simple sentence like this.

The normal form is:

• هذا التصرف سيئ

Arabic does not usually insert a separate pronoun like هو between the subject and the predicate in basic present-tense sentences.

So for a learner, the safest choice is:

• هذا التصرف سيئ = This behavior is bad

Because Arabic adjectives normally come after the noun they describe.

So:

• تصرف سيئ = bad behavior
• literally: behavior bad

In this sentence, سيئ is functioning as the predicate of the sentence:

• هذا التصرف سيئ = This behavior is bad

So even though it comes after the noun, that is exactly what Arabic normally does.

This is an important distinction.

Here, سيئ is not part of a noun phrase like the bad behavior.
It is the predicate of the sentence:

• هذا التصرف سيئ = This behavior is bad

So:

• التصرف is definite: the behavior
• سيئ is indefinite: bad

Compare that with:

• التصرف السيئ = the bad behavior

In that phrase, السيئ is a regular adjective describing a definite noun, so it also becomes definite with الـ.

So the difference is:

• هذا التصرف سيئ = This behavior is bad
• هذا التصرف السيئ = this bad behavior

It is originally an adjective meaning bad, but in this sentence it works as the predicate of a nominal sentence.

So grammatically, you can think of it as:

• an adjective in form
• a predicate in function

That is why the sentence means:

• This behavior is bad

and not

• this bad behavior

It is pronounced approximately:

• at-taṣarruf

A few useful points:

• The الـ is written, but here the ل is not clearly pronounced because ت is a sun letter
• So ال + تصرف becomes pronounced like at-taṣarruf
• The ṣ sound in taṣarruf is an emphatic s
• The doubled middle consonant means you hold it slightly longer: ta-ṣar-ruf

So although it is written التصرف, you say something close to at-taṣarruf.

It is usually pronounced:

• sayyiʾ

Helpful breakdown:

• sa / say
• then a doubled y
• then a final hamza sound: ʾ

So the word ends with a small glottal stop.
It is not pronounced like a smooth ending without a break.

A rough guide:

• say-yi’

The hamza matters here, because it is part of the spelling and pronunciation.

The final ء is a hamza, which represents a glottal stop.

In سيئ:

• it is not silent
• it helps form the correct pronunciation: sayyiʾ

For English speakers, a glottal stop is the little catch in the throat you may hear in the middle of some pronunciations of uh-oh.

So the word does not end as a smooth sayyi; it ends as sayyiʾ.

In fully vowelled, formal grammar, it would be:

• هٰذا التصرّفُ سيِّئٌ

Or in transliteration:

• hādhā at-taṣarrufu sayyiʾun

Why?

• هذا is a demonstrative and has its own fixed form here
• التصرفُ is the subject of the nominal sentence, so it is in the nominative
• سيئٌ is the predicate, also in the nominative

In everyday reading and speech, these final case endings are often omitted, so learners usually encounter:

• هذا التصرف سيئ

التصرف can cover several related meanings, depending on context:

• behavior
• conduct
• action
• way of acting
• response or reaction, in some situations

So هذا التصرف سيئ could mean:

• This behavior is bad
• This action is wrong
• This way of acting is bad

The best English translation depends on the situation.

Not exactly as the most direct reading.

The most natural meaning is:

• This behavior is bad
• This action is wrong

If you want This is bad behavior, Arabic would usually be structured differently, such as:

• هذا تصرف سيئ

That version is more like:

• This is bad behavior / this is a bad action

So the original sentence points more clearly to a specific behavior and comments on it.

Yes, but the meaning becomes less specific.

• هذا سيئ = This is bad
• هذا التصرف سيئ = This behavior is bad

So adding التصرف tells us exactly what is being judged as bad.

Because in this sentence, سيئ is not being used as an attributive adjective inside a noun phrase. It is the predicate.

Compare:

1. التصرف السيئ

   • the bad behavior
   • Here السيئ is a normal adjective modifying التصرف
   • So it agrees in definiteness

2. هذا التصرف سيئ

   • This behavior is bad
   • Here سيئ is the predicate
   • Predicates are usually indefinite

So Arabic agreement rules are still being followed; it is just a different sentence structure.

It is neutral standard Arabic and works well in Modern Standard Arabic.

It would be appropriate in:

• teaching materials
• formal writing
• news-style language
• polite correction
• general standard usage

In everyday spoken dialects, people may say different forms, but this sentence is perfectly normal in MSA.

One possible MSA version is:

• هذه التصرفات سيئة

Breakdown:

• هذه = these for non-human plural or feminine singular forms
• التصرفات = actions/behaviors
• سيئة = bad in the appropriate agreeing form

So:

• هذه التصرفات سيئة = These actions/behaviors are bad

This is useful because learners often want to know how the pattern changes in the plural.

The feminine form is:

• سيئة

So for a feminine noun, you would use:

• هذه الفكرة سيئة = This idea is bad

But in your sentence, التصرف is masculine, so the correct form is:

• سيئ

Yes, a few very common points:

1. No written word for is

   • Arabic often omits present-tense to be

2. Demonstrative + definite noun

   • هذا التصرف literally looks like this the-behavior, but that is normal Arabic

3. Adjective/predicate after the noun

   • Arabic puts adjectives after nouns

4. Indefinite predicate

   • سيئ does not take الـ here because it means is bad, not the bad

5. Pronunciation details

   • التصرف is pronounced at-taṣarruf
   • سيئ ends with a real hamza

Those are exactly the kinds of things that often confuse English-speaking learners at first.