Otherwise, if you let these looney-tunes have the general run of the everyday world, there's no telling what kinds of destruction they may cause if left unchecked.
disapproval If you describe someone's behaviour or ideas as loony, you mean that they seem mad, strange, or eccentric. Some people consider this use offensive. What's she up to? She's as loony as her brother!
disapproval If you refer to someone as a loony, you mean that they behave in a way that seems mad, strange, or eccentric. Some people consider this use offensive. At first they all thought I was a loony. loonies someone who is crazy or strange. silly, crazy, or strange