This is the 9259th most frequent Portuguese word.
casadas
"Casadas" means "married" (feminine plural).
In this sentence, 'casadas' acts as an adjective describing the marital status of the sisters.
As irmãs estão todas casadas.
The sisters are all married.
Here, 'casadas' is used as a verb in the passive form, meaning 'to be matched'.
Esses documentos precisam ser casadas nos registros oficiais.
These documents need to be matched in the official records.
In this context, 'casada' serves as an adjective derived from the verb, describing how the color combination fits well together.