cynic
/ˈsɪnɪk; `sɪnɪk/ n
1 person who believes that people do not do things for good, sincere or noble reasons, but only for their own advantage 愤世嫉俗者.
2 Cynic member of a school of ancient Greek philosophy that despised ease and comfort （古希腊哲学）犬儒学派的成员.