PARANOID

[adjective]He started feeling paranoid and was convinced other people were tricking him and lying to him.Neighbouring countries are paranoid (= extremely worried) about the possibility of a disastrous explosion at one of these old-fashioned nuclear reactors.They have a paranoid theory that it's all a big conspiracy.(specialized) He was diagnosed as a paranoid schizophrenic and confined in a psychiatric hospital.(saying) 'Just because I'm paranoid it doesn't mean that they're not out to get me'.