What is the name/adjective of a human who doesn't believe in God but s/he is honest and does good in his/her life?

I know a person who doesn't believe in God is an atheist but this name can't convey the reality of that human. There are many theists who are liar,violent,dishonest,prejudice and cheater but there are also many atheists who are honest,open-minded,kind and just. What does Islam call a person owner of this good character but atheist?