You Could Say

You could say, "I want ice cream."
Or you could say, "I have a certain craving for the cool sensation that comes from consuming that common dessert that consists of cream, sugar, and various flavorings."
You could say, "I hate math class."
Or you could say, "I strongly reprehend that despicable and monotonous class in which we are instructed about the numerical system, its patterns, and how to apply them to real life."
You could say "You need a bath."
Or you could say, "Dear friend, during the course of the morning, I seemed to notice a certain stench in the area. After further investigation, I concluded that said smell was a result of lack of hygiene on your part. I suggest you take appropriate action by alternately dousing yourself with water and scrubbing yourself with soap."

See how much more fun it is? So when school starts, don't complain about those vocab test!