Lawyers, politicians and academics are the worst when it comes to using jargon.
A major conference on plain speaking is being held in Dublin today.
Over 60 international experts are getting together to discuss how clearer language leads to greater efficiency and effectiveness in a number of walks of life.
I've been speaking to Dr Neil James - Executive Director of the Plain Englaish Foundation in Australia.
I began by asking him who are the worst culprits:
