Sure, but if you google the definition of the word we're all talking about, there's no mention of impossible. Just someone that, "see[s] the worst aspect of thi

Sure, but if you google the definition of the word we're all talking about, there's no mention of impossible. Just someone that, "see[s] the worst aspect of things or believe[s] that the worst will happen". So basically, it's the person you might want around when you're building a bridge, or a jet, or a shuttle.