A történelmi dísztárgy drága.

Here a means the, not a/an.

Hungarian has two forms of the definite article:

• a before a consonant sound
• az before a vowel sound

So:

• a történelmi dísztárgy = the historical decorative object
• az alma = the apple

If you wanted a/an in the indefinite sense, you would use egy.

In Hungarian, the verb to be is usually omitted in the present tense, third person singular and plural when linking a subject to a noun or adjective.

So:

• A tárgy drága. = The object is expensive.
• literally, Hungarian says something like The object expensive.

But in other persons, Hungarian does use the verb:

• Én drága vagyok. = I am expensive.
• Te drága vagy. = You are expensive.

And in past or future tense, the verb also appears:

• A tárgy drága volt. = The object was expensive.

Because drága is not directly modifying the noun inside the noun phrase here. It is the predicate adjective: it tells you something about the subject.

So:

• A történelmi dísztárgy drága. = The historical decorative object is expensive.

But if you put drága before the noun, it becomes part of the noun phrase:

• A drága történelmi dísztárgy = the expensive historical decorative object

So position matters:

• before the noun = attributive adjective
• after the noun phrase = predicate adjective

Because Hungarian adjectives normally do not agree with the noun in the way adjectives often do in many Indo-European languages.

So the adjective stays the same:

• történelmi dísztárgy
• történelmi tárgyak

The noun may change for number or case, but the adjective often remains unchanged unless it is used in certain special constructions.

This is much simpler than in languages where adjectives change for gender, number, or case.

Dísztárgy is basically a compound noun:

• dísz = decoration, ornament
• tárgy = object, item

Together, dísztárgy means something like:

• decorative object
• ornamental item
• ornament

The exact English translation depends on context.

Hungarian forms compounds very naturally, so seeing long compound nouns is completely normal.

Yes. Történelmi means historical, and it is derived from történelem, which means history.

So:

• történelem = history
• történelmi = historical

This is a very common pattern in Hungarian: a noun can become an adjective with a suffix.

No. Drága can also mean dear or beloved, depending on context.

For example:

• Ez a kabát drága. = This coat is expensive.
• drága barátom = my dear friend

In your sentence, because the subject is an object, the meaning is clearly expensive, not dear.

It is in the nominative, the basic dictionary form.

In this sentence, a történelmi dísztárgy is the subject, so no special case ending is needed.

Hungarian often adds endings for roles like:

• object
• location
• direction
• possession, etc.

But the plain subject form usually has no ending.

So:

• dísztárgy = subject/basic form
• dísztárgyat = object form

Yes, Hungarian word order is flexible, but changing it often changes the focus or emphasis, not just style.

The sentence as given:

• A történelmi dísztárgy drága.

is a neutral way to say The historical decorative object is expensive.

You might also hear other orders in a specific context, but they would usually highlight something different. For a learner, the given version is the safest neutral pattern.

The accents are important in Hungarian. They are not optional spelling marks.

In this sentence:

• á in drága is a long vowel
• é in történelmi is also long
• ö in történelmi is a rounded vowel, somewhat like the vowel in German schön or French peu

A rough pronunciation guide:

• A = short aw
• történelmi ≈ tur-TAY-nel-mi with rounded ö
• dísztárgy ≈ DEES-taargy
• drága ≈ DRAA-ga

The exact sounds are best learned by listening, but the key point is: vowel length and quality matter in Hungarian, and they can change meaning.

Usually, a makes the noun phrase definite, so the sentence most naturally means:

• The historical decorative object is expensive.

If you wanted a more indefinite meaning, you would typically use egy:

• Egy történelmi dísztárgy drága. = A historical decorative object is expensive.

That said, English and Hungarian do not always use articles in exactly the same way, so context still matters.