A tranzakció gyanús.

A is the Hungarian definite article, so here it means the.

Hungarian has two forms of the definite article:

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

Since tranzakció begins with t, you use a:

• a tranzakció = the transaction

If you wanted a/an transaction, you would normally use egy:

• egy tranzakció = a transaction

In Hungarian, the verb to be is usually left out in the present tense, third person singular, when you are linking a subject to a noun or adjective.

So:

• A tranzakció gyanús. literally looks like The transaction suspicious. but means The transaction is suspicious.

This is completely normal Hungarian.

Compare:

• A tranzakció gyanús. = The transaction is suspicious.
• A tranzakció gyanús volt. = The transaction was suspicious.

In the past tense, the verb appears: volt = was.

Gyanús is an adjective meaning suspicious.

In this sentence, it is used predicatively, meaning it describes the subject:

• A tranzakció gyanús. = The transaction is suspicious.

This is different from using it directly before a noun:

• egy gyanús tranzakció = a suspicious transaction

So the same adjective can be used in both ways, just like in English.

Yes.

Both are possible, but the emphasis is a little different.

• A tranzakció gyanús. = neutral statement: The transaction is suspicious.
• Gyanús a tranzakció. = stronger focus on gyanús, roughly The transaction is suspicious / It’s the transaction that seems suspicious

Hungarian word order is more flexible than English word order. It often reflects topic and focus, not just grammar.

So the original version is the most neutral, straightforward one.

Approximate pronunciations:

• tranzakció ≈ TRON-zak-tsee-oh
• gyanús ≈ DYAH-noosh

A few useful details:

• Hungarian words are usually stressed on the first syllable
• the s in Hungarian is pronounced like English sh
• the gy in gyanús is a single Hungarian consonant, not a normal English g plus y

If you like IPA:

• tranzakció: [ˈtrɒnzɒkt͡sijoː]
• gyanús: [ˈɟɒnuːʃ]

The accents mainly show vowel length.

So:

• ó is a long o
• ú is a long u

That means these vowels are held longer than plain o and u.

In Hungarian, vowel length is important and can change meaning, so it is not just a spelling detail.

Yes, it is an international/borrowed word, and it is very close in meaning to English transaction.

But in Hungarian it behaves like a normal Hungarian noun. It can take articles, plural endings, and case endings:

• a tranzakció = the transaction
• tranzakciók = transactions
• tranzakciót = transaction as a direct object
• tranzakcióban = in the transaction

So even though it looks familiar, you still use normal Hungarian grammar with it.

For gender, no: Hungarian does not have grammatical gender like English he/she distinctions in adjectives. So gyanús does not change for masculine, feminine, or neuter.

For number, there is an important difference:

• In front of a noun, the adjective does not take a plural ending:
  • gyanús tranzakciók = suspicious transactions
• As a predicate, it can show plural:
  • A tranzakció gyanús. = The transaction is suspicious.
  • A tranzakciók gyanúsak. = The transactions are suspicious.

So in your sentence, gyanús stays singular because tranzakció is singular.

You would put the adjective before the noun:

• egy gyanús tranzakció = a suspicious transaction
• a gyanús tranzakció = the suspicious transaction

That is different from:

• A tranzakció gyanús. = The transaction is suspicious.

So:

• gyanús tranzakció = adjective directly modifying the noun
• A tranzakció gyanús. = full sentence describing the transaction

To make it negative, add nem before the adjective:

• A tranzakció nem gyanús. = The transaction is not suspicious.

To make it a yes/no question, Hungarian can keep the same word order and use intonation in speech or a question mark in writing:

• A tranzakció gyanús? = Is the transaction suspicious?

You may also hear:

• Gyanús a tranzakció?

That version puts a bit more focus on gyanús.