in-uh-vAY-tiv
Here's a breakdown:
* in- is pronounced like the "in" in "in"
* uh- is a short, unstressed vowel sound, similar to the "uh" in "up"
* vAY- is pronounced like the "way" in "way"
* tiv is pronounced like the "tiv" in "active"
So, it's basically "in-uh-way-tiv".