cur non

• (Classical Latin) IPA^(key): /kuːr noːn/, [kuːr noːn]
• (modern Italianate Ecclesiastical) IPA^(key): /kur non/, [kur nɔn]

cūr nōn?

1. why not?

   Cūr ego tēcum nōn sum?

   Why am I not with you?

   Cūr nōn illam hūc transferrī iubēs?

   Why don't you command her to be brought over hither?

   Cūr nōn ēmistī restem suspendiō?

   Why do you not buy a halter, and hang yourself?

• While cūr nōn? expects an answer, quid ni? is rather used in rhetorical questions.