Kötőszavak - mert / Conjunctions - because

Here are a few synonyms of 'mert' (because). All of them are interchangable as they mean the same. There is a difference, though, in register. 'Mert' is used in colloquial, the others are used in more formal language.

So the following words all mean 'because'.
mert, mivel, ugyanis, hiszen, tudniillik
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Példamondatok / Example sentences

Nem mentem este moziba, mert nagyon fáradt voltam.
Nem mentem este moziba, mivel nagyon fáradt voltam.
Nem mentem este moziba, ugyanis nagyon fáradt voltam.
Nem mentem este moziba, hiszen nagyon fáradt voltam.
Nem mentem este moziba, tudniillik nagyon fáradt voltam.
   I didn't go to the cinema because I was very tired.