Certain (Adjective) Not having any doubt about something; convinced or sure. I am certain that I turned all of my work in and don't have any missing work.
Falsify (Verb) To make something false; to change something in order to make people believe something that is not true. I told all of my friends a falsify that I have 15 dogs and cats.
Claustrophobic (Adjective) Having a fear of being in closed or small spaces; used to describe a small closed in room with little spaces. I am claustrophobic when I am in a small space with a lot of people.