Japanese:
* Junsui (純粋): Pronounced like "joon-soo-ee"
Chinese (Simplified: 纯粹; Traditional: 純粹):
* Chúncuì: Pronounced like "choong-tsway"
Without more context, it's difficult to say definitively how to pronounce "junsui." Please let me know if you can provide more information about the origin of the word!