This is the 14666th most frequent Russian word.
переполнена
"Переполнена" means "overfilled" or "overcrowded" in English.
Here, "переполнена" describes the state of the room being filled beyond capacity by people, emphasizing a physical overcrowding.
Комната переполнена людьми.
The room is overcrowded with people.
In this sentence, "переполнены" is used metaphorically to mean that one's thoughts are dominated by feelings of anxiety, showing emotional or mental saturation.
Мои мысли переполнены тревогой.
My thoughts are overwhelmed with anxiety.
Here, "переполнена" indicates that the box is physically filled beyond its limit with toys, a literal usage emphasizing containment and overcapacity.