Useful : Able to be used for a practical purpose. Useful for what? Making people happy? Killing fire-ants? Repelling purple elephants? You're gonna need to de

Useful : Able to be used for a practical purpose. Useful for what? Making people happy? Killing fire-ants? Repelling purple elephants? You're gonna need to define a purpose for that to mean anything. (I suspect trying would look a lot like politics)