There are multiple definitions - click on the translation that matches your context.

rejtett hiba

főnév

partial

hidden defect

noun

Comparative law notes

Hungary

A particular error/defect that was not actually known and was not discoverable, even in the exercise of due care by the consumer.

Definitions of hidden defect

English

a fault that cannot be seen, that the seller or service provider knows about, and that cannot be easily discovered by close examination

If you are selling a house, and know of a hidden defect, you should seek legal advice to avoid liability down the road.