This is the 12962nd most frequent Spanish word.
perdidas
Losses.
Here, 'perdidas' is used as an adjective describing the keys being physically lost or misplaced.
Las llaves están perdidas y no podemos abrir la puerta.
The keys are lost, and we cannot open the door.
In this sentence, 'perdidas' functions as a noun (losses) implying emotional or intangible losses.
Ella siente perdidas por los momentos que no pudo compartir con su familia.
She feels losses for the moments she couldn't share with her family.
Here, 'perdidas' is used as a noun (losses) referring to financial disadvantages in this context.