The antonyms for the word "dis-believed" are "believed" and "trusted". When you believe something, you accept it as true or real, whereas when you disbelieve something, you reject it as false or fake. To believe is to have faith, conviction or trust in something or someone. It is to have confidence in someone's capabilities, character or reliability. On the other hand, to disbelieve is to distrust, suspect or doubt someone's integrity, intentions or motives. Therefore, believing and disbelieving are opposite attitudes or states of mind that people can have towards each other or towards a particular situation.