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sei serio

be serious

→ essere
phrase Common #3,087
be serious Used to describe someone as serious or to question whether they are serious. The adjective agrees with the person’s gender: serio for masculine and seria for feminine. Other forms include ero serio (“I was serious”) and era serio (“he was serious”).
IT: Sei serio quando parli di lavoro.
EN: You are serious when you talk about work.

Riguardo a questa relazione, sei serio oppure no?

Regarding this relationship, are you serious or not?

— Zindagi Na Milegi Dobara (2011)

Sei serio?!

Are you serious?!

Ma sei serio?

Are you serious?

— Die My Love (2025)

Sei serio, vero?

You're serious, right?

Sei serio?

Are you serious?

— Il castello errante di Howl (2004)

Dimmi che non sei serio.

Tell me you’re not serious.

Ruben, sei serio?

Ruben, are you serious?

— F1 - Il film (2025)

Quando sei serio?

When are you serious?

— Kal Ho Naa Ho (2003)

Sei serio..?

Are you serious..?

— Goksung - La presenza del diavolo (2016)

Wow, come sei serio.

Wow, you're so serious.

— The Way He Looks (2014)