> an optimist is said to see the glass as half full, while a pessimist sees the glass as half empty. But even the optimist sees that the glass is only a half f

> an optimist is said to see the glass as half full, while a pessimist sees the glass as half empty. But even the optimist sees that the glass is only a half full. Naivety is thinking that half full is the best possible outcome or the only possible outcome. It literally means "lack of judgement"