उसका आचरण गलत है।

उसका is the possessive form meaning his / her / its here, and it agrees with the noun being possessed, not with the owner.

The noun आचरण is masculine singular, so the possessive must be उसका.

Compare:

• उसका आचरण = his/her conduct
• उसकी किताब = his/her book (किताब is feminine)
• उसके दोस्त = his/her friends (दोस्त is plural)

So in this sentence, उसका is used because आचरण is masculine singular.

It can mean his, her, or sometimes its, depending on context.

Hindi often does not mark gender in third-person possessives the way English does. So:

• उसका आचरण गलत है। can mean:
  • His conduct is wrong.
  • Her conduct is wrong.

You usually understand which one is meant from the wider context.

आचरण means conduct, behavior, or manner of conduct. It is a bit more formal or bookish than some everyday alternatives.

Common comparisons:

• आचरण = conduct, moral behavior, way of acting; somewhat formal
• व्यवहार = behavior, dealings, conduct; common and fairly neutral
• बर्ताव = behavior, way someone treats others; very common in speech

So उसका आचरण गलत है। sounds natural, but somewhat formal—like something you might read, hear in a school setting, or use in serious discussion.

Because गलत is an indeclinable adjective in normal use. That means it usually stays the same regardless of gender or number.

So you get:

• उसका आचरण गलत है।
• उसकी आदत गलत है।
• उनके फैसले गलत हैं।

In all of these, गलत stays गलत.

This is different from adjectives like:

• अच्छा (masculine singular)
• अच्छी (feminine singular)
• अच्छे (masculine plural / polite / oblique)

So:

• अच्छा आचरण
• अच्छी आदत
• अच्छे लोग

But with गलत, the form usually does not change.

है is the present-tense form of to be for a singular subject.

This sentence is literally structured like:

• उसका आचरण = his/her conduct
• गलत = wrong
• है = is

So the full structure is: His/Her conduct wrong is → natural English: His/Her conduct is wrong.

If the subject were plural, you would use हैं:

• उनका आचरण गलत है।
  This can still take है if आचरण is understood as a singular mass-like noun.
• उनके काम गलत हैं। = Their actions are wrong.

The normal, neutral order is:

उसका आचरण गलत है।

This is the most straightforward way to say it.

Hindi word order is somewhat flexible, so गलत है उसका आचरण is possible, but it sounds marked or emphatic, something like:

• Wrong is his conduct
• It is his conduct that is wrong

A learner should usually stick with: possessor + noun + adjective/complement + है

So the safest pattern is:

• उसका आचरण गलत है।
• उसकी आदत अच्छी है।
• उनका व्यवहार ठीक है।

That would not mean the same thing in normal usage.

• उसका आचरण गलत है। = His/Her conduct is wrong.
• उसका गलत आचरण... = his/her wrong conduct...

In उसका गलत आचरण, the adjective गलत directly describes the noun आचरण inside the noun phrase. That phrase usually needs something more after it, for example:

• उसका गलत आचरण सबको परेशान करता है।
  = His/Her wrong conduct troubles everyone.

So if you want a complete sentence meaning His/Her conduct is wrong, use: उसका आचरण गलत है।

Hindi usually does not use articles like English a, an, and the.

So उसका आचरण गलत है। naturally means:

• His conduct is wrong or
• Her behavior is wrong

Hindi leaves article-like meanings to context. This is very normal.

For English speakers, this can feel strange at first, but in Hindi it is the standard pattern.

Unfortunately, noun gender in Hindi often has to be learned along with the word itself. There are patterns, but they are not always fully predictable.

In this sentence, one clue is the possessive:

• उसका shows that the possessed noun is masculine singular

You may also notice that dictionaries list noun gender. A good learning habit is to memorize new nouns with gender:

• आचरण — masculine
• किताब — feminine
• व्यवहार — masculine
• आदत — feminine

That makes it easier to choose the right possessive and adjective forms later.

Yes, it is a little formal because of आचरण.

More everyday alternatives include:

• उसका व्यवहार गलत है। = His/Her behavior is wrong.
• उसका बर्ताव गलत है। = His/Her behavior is wrong.
• वह गलत व्यवहार करता है। = He behaves wrongly / He behaves badly.
• वह गलत व्यवहार करती है। = She behaves wrongly / She behaves badly.

So:

• आचरण = more formal
• व्यवहार / bर्ताव = more common in everyday speech

It is pronounced approximately aa-cha-ran.

A more careful transliteration is ācaraṇ.

A few pronunciation notes:

• आ = long aa
• च = ch as in chair
• The final ण is a retroflex n sound, made with the tongue curled slightly back

If saying the retroflex ण is difficult, many learners first say a regular n-like sound. Native speakers will usually still understand you, though the more accurate pronunciation is helpful over time.

Yes. Because आचरण often has a slightly moral or ethical tone, उसका आचरण गलत है। can sound like a judgment about someone’s conduct in a broader sense, not just one small action.

It can imply:

• the way he/she behaves is improper
• his/her conduct is morally wrong
• his/her behavior is unacceptable

So compared with a more neutral word like व्यवहार, आचरण can feel a bit more serious or evaluative.