The terms we use to describe mental illness matter. We have all heard derogatory terms used to describe someone who has a mental illness. Here are a few to jog your memory: Cuckoo; Mad as a hatter; Screwy – having a screw loose; Bananas; Loopy; Crackers; Wacko (whacko); Loony; Nuts; Freak; Crazy; Weirdo. Can you imagine mocking someone with an illness such as cancer or heart disease? Here's how we can do better.