This is the 14113th most frequent Spanish word.
terribles
Terribles: terrible; dreadful; awful.
Here, 'terribles' is used as an adjective describing 'tormentas', emphasizing their intensity and negative impact.
Las tormentas terribles asustaron a los habitantes.
The terrible storms frightened the inhabitants.
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.