WordReference English-Spanish Dictionary © 2025:
| Principal Translations |
| Why not? expr | (why is that not so?) | ¿por qué no? loc interj |
| | You're not coming to the party? Why not? |
| why not interj | informal (expressing openness to [sth]) | por qué no expr |
| | Yes of course you can come along – why not! |
| | Sí, claro que pueden venir con nosotros, ¿por qué no? |
| why not expr | (expressing openness to [sth]) | por qué no expr |
| | A: Mum, can I stay over at Jess's house tonight? B: I can't see why not. |