One goes through a PHASE (e.g. "Le R. Père had slowly come to realize his daughter's rabid communism was, tragically, not just a phase"); one is unFAZEd if one is unruffled by distressing circumstances (e.g. "Yo, dude, I was like so not fazed by that zombie just now"). FAZE. FAZE. IT'S A DIFFERENT WORD. That's all. Thank you.