When people think about a place, and they don’t find a place on a map, they think “This map sucks”. Or when people find a nice spot and it’s not in the guidebook, they think “Oooh, this place must be cool, it’s not in the guidebook”. But when they find a word that’s not in the dictionary, they think “This must be a bad word”. Why? It’s more likely to be a bad dictionary.