μὴ

From LSJ

ἑνὸς ἀτόπου δοθέντος τἆλλα συμβαίνει → one absurdity having been given, the others follow

Source

English (Woodhouse)

in questions expecting the answer no

⇢ Look up on Google | Wiktionary | LSJ full text search (Translation based on the reversal of Woodhouse's English to Ancient Greek dictionary)