Questions & Answers about Vstupné je drahé.
Here vstupné means admission fee, entrance fee, or simply admission in the sense of the money you pay to get in.
So the sentence means something like:
- Admission is expensive.
- The entrance fee is expensive.
It usually refers to the cost of entry, not the physical ticket.
In this sentence, it functions as a noun.
More specifically, it is a substantivized adjective: a word that historically looks like an adjective, but is used as a noun. That is why it has an adjective-like ending -é.
So even though it means a thing, it behaves grammatically in some ways like an adjective.