1. Hebrew: If "Vidui" refers to the Jewish prayer of confession, it's pronounced "vi-d'oo-ee".
* vi- as in "victory"
* d'oo- as in "do" with a slight "d" sound at the beginning
* ee as in "see"
2. General English: If "Vidui" is a name or a word not related to the Hebrew prayer, it can be pronounced "vi-doo-ee".
* vi- as in "victory"
* doo- as in "do"
* ee as in "see"
It's important to consider the context to know which pronunciation is appropriate.