sería un error

would be a mistake

→ ser
phrase Rare #45,657
would be a mistake Used to describe a hypothetical or potential action or situation.
SP: Ignorar el problema sería un error.
EN: Ignoring the problem would be a mistake.

Eso sería un error.

That would be a mistake.

— Perfectos desconocidos (2016)

Sería un error terrible.

It would be a terrible mistake.

— El Canto del Lobo (2019)

Esto sería un error.

This would be a mistake.

Sin música la vida sería un error.

Without music, life would be a mistake.

Sería un error salvaje.

That would be a wild mistake.

— El espejo (1975)

Tom cree que hacer eso sería un error.

Tom believes that doing that would be a mistake.