This is the 228th most frequent Slovak word.
karanténe
"Quarantine."
The word 'karanténe' is used as a locative case noun to specify where he had to stay.
Po návrate z cestovania musel zostať v karanténe.
After returning from traveling, he had to stay in quarantine.
Here, the word 'karantény' is in the genitive case, indicating possession of the rules.
Dodržiavanie pravidiel karantény pomáha chrániť verejné zdravie.
Following quarantine rules helps protect public health.
In this sentence, 'karanténe' is again in the locative case, referencing the physical or modal state of being in quarantine.