Διαπορείς, in rhetoric, is used to express the hesitation or uncertainty of the speaker.

We have an example in Homer, where Ulysses, going to relate his sufferings to Alcinous, begins thus:

Τι πάσχων, τι ἐλευθερῶν, τι ἀναγκαῖον καταβαίνω; Quid primum, quid dein te, quid primum alleguar?

This figure is most naturally placed in the exordium or introduction to a discourse. See DOUBTING.