This is the 14113th most frequent Spanish word.
terribles
Terribles: terrible; dreadful; awful.
In this case, 'terribles' qualifies 'errores', highlighting their severity and the consequences that arose from them.
Estos terribles errores causaron muchas pérdidas.
These terrible errors caused many losses.
Here, 'terribles' is used to express a subjective opinion about the paintings seen, indicating that they were perceived negatively.
Vimos unas pinturas terribles en el museo.
We saw some terrible paintings in the museum.
Here, 'terribles' is used as an adjective describing 'tormentas', emphasizing their intensity and negative impact.