This is the 281st most frequent Icelandic word.
haldinn
Possessed, afflicted, gripped, or consumed (by something).
In this sentence, 'haldinn' is used to describe being gripped or consumed by an emotion or mental state.
Hann var haldinn miklum kvíða í gær.
He was consumed by great anxiety yesterday.
Here, 'haldinn' is used to imply that something is being kept or maintained in a certain state, such as secrecy.
Bókin sem hún lánaði mér er enn haldinn í leynd.
The book she lent me is still kept secret.
In this third example, 'haldinn' describes the feast as being well-managed or well-organized, denoting something that is properly executed or arranged.