Inauspicious

This word came to mind as I was nuking some leftovers on a microwave-safe plate and, a few seconds before the timer went off, I heard a loud snap. The plate had cracked almost exactly in half, a very clean break. Holding the two pieces together so that my food would not fall through the chasm, I dumped my dinner on a different, microwave-safe plate and tossed the other one into the trash. I wondered what "microwave-safe" meant in this context.