"Parbrizele nu sunt colorate."

Would "The windshields are not tinted" be correct? If it's just a vocab test then ... whatever, but if referring to windshields in cars then we have tinted and not tinted, but nothing "coloured" and the word would be very unnatural.

that's a very rare word to learn I believe

Could you use "nuanțat" (instead of "colorate")?

In Britain, and relating to cars, we refer to "windscreens" not "windshields".