A cynic is a person who has a negative outlook on life and believes that people are generally selfish and untrustworthy. A MISANTHROPE is a person who dislikes or distrusts humanity in general, a sneerer is someone who expresses contempt or ridicule through a mocking expression, a DETRACTOR is someone who speaks negatively of another person, a DOUBTER is someone who questions the truth of something, a NONBELIEVER is someone who does not accept a particular set of beliefs, a PESSIMIST is someone who expects the worst possible outcome, a DISBELIEVER is someone who does not accept the truth of something, a SCOFFER is someone who expresses contempt or ridicule through laughter, a MISANTHROPE is another word for a MISANTHROPE, and a SCEPTIC is someone who doubts the truth of something. The term 'ISM' is used to refer to a system of beliefs or principles.