This is the 13727th most frequent Spanish word.
ruin
Wicked, vile, or despicable.
In this context, "ruina" refers to the state of disrepair or decay, often associated with old or neglected structures.
El castillo abandonado estaba en estado de ruina.
The abandoned castle was in a state of ruin.
Here, "ruin" is used adjectivally to describe something morally reprehensible or despicable.
Fue una decisión ruin tracionar la confianza de tu mejor amigo.
It was a vile decision to betray the trust of your best friend.
In this case, "ruinas" is used metaphorically to refer to the destroyed or severely damaged state of the business.