A fiú lassan öltözik, de a testvére már vár rá az ajtónál.

Hungarian has two forms of the definite article: a and az. They both mean the.

• a is used before a consonant sound: a fiú, a testvére
• az is used before a vowel sound: az ajtónál

So the choice is about pronunciation, not about meaning.

Öltözik means gets dressed or is getting dressed. It usually means that someone is putting clothes on themselves.

So here A fiú lassan öltözik means the boy is dressing himself slowly.

A useful contrast is:

• öltözik = get dressed, dress oneself
• öltöztet = dress someone else

Because lassú is an adjective, while lassan is an adverb.

• lassú = slow
• lassan = slowly

In the sentence, the word describes how the boy is dressing, so Hungarian uses the adverb: lassan.

Hungarian usually does not mark the difference between dresses and is dressing the way English does.

The present tense form öltözik can mean either:

• he dresses
• he is dressing

The context tells you which one is more natural. In this sentence, the situation clearly suggests an ongoing action, so English translates it as is dressing.

The base word is testvér, which means sibling.

The ending -e is a possessive suffix, so testvére means:

• his sibling
• her sibling

So a testvére means his/her sibling or more naturally in English here, his sibling.

Hungarian often shows possession with a suffix on the noun instead of using a separate word like his.

Mostly from context.

The sentence first mentions a fiú (the boy), and then says a testvére (his/her sibling). The most natural reading is that the sibling belongs to the person just mentioned: the boy.

Hungarian often leaves this kind of thing to context. Also, Hungarian does not mark gender here, so testvére could mean his sibling or her sibling in a different context.

Not specifically. Testvér is gender-neutral and means sibling.

So a testvére could refer to:

• a brother
• a sister

If Hungarian wants to be more specific, it uses different words, but testvér itself does not tell you the gender.

Because vár can be used in more than one pattern, and vár valakire is a very common way to say wait for someone.

Here, rá belongs with vár as part of the verb pattern:

• vár valakire = wait for someone
• vár valamire = wait for something

So vár rá means waits for him/her.

A direct-object version can also exist in Hungarian in some contexts, but vár rá is very natural here because the idea is that the sibling is waiting for the boy to finish dressing and come along.

Rá is a pronoun form built from ő (he/she/it) with the ending -ra/-re.

Very roughly, -ra/-re often means onto or for/toward, depending on the verb and context. With vár, it is just the normal pattern for wait for.

So in this sentence, rá means for him/her.

You may also see similar forms like:

• rám = for me / onto me
• rád = for you / onto you
• rá = for him/her / onto him/her

Már means already or by now.

It shows that the sibling is ready and waiting before the boy has finished dressing.

So the contrast is:

• the boy is still dressing
• the sibling is already waiting

That helps create the sense of impatience or time difference.

The noun is ajtó = door.

The ending -nál/-nél means at, by, or near.

So:

• ajtónál = at the door / by the door

And because ajtónál begins with a vowel sound, the article is az: az ajtónál.

This does not mean in the door. It means someone is standing or waiting near the door.

No, Hungarian word order is fairly flexible, but the given order is natural and neutral:

A fiú lassan öltözik, de a testvére már vár rá az ajtónál.

This order presents the information smoothly:

• A fiú = topic
• lassan öltözik = what he is doing
• de = contrast
• a testvére már vár rá = the contrasting action
• az ajtónál = location

You could move parts around for emphasis, but that would slightly change what feels most important. For example, putting az ajtónál earlier would emphasize the location more.