by chance, coincidentally
Casualmente, le van de perlas a las uñas, lo que es un extra.
As it happens, they go perfectly with the nails, which is a bonus.
— Juno (2007)
Tom casualmente se encogió de hombros.
Tom casually shrugged.
No pasó mucho antes de que nos encontráramos casualmente otra vez.
It wasn't long before we ran into each other by chance again.
I just happen to have it here.
Casualmente, hay dos hombres blancos que me siguen a todos lados.
Coincidentally, there are two white men who follow me everywhere.
— Malcolm X (1992)
Como Leah, a quien casualmente le van los profesores.
Like Leah, who happens to be into teachers.
— Juno (2007)
Y que hoy casualmente coincidimos.
And it just so happens that we ran into each other today.
— Wicked (2024)
Casualmente mañana es el día más largo del año.
Coincidentally, tomorrow is the longest day of the year.