a person who believes that people only do things to help themselves, rather than for good or sincere reasons 认为人皆自私的人；愤世嫉俗者 Don’t be such a cynic! 不要这样愤世嫉俗！
a person who does not believe that something good will happen or that something is important 悲观者；怀疑者
Word Originmid 16th cent. originally relating to a member of a school of ancient Greek philosophers founded by Antisthenes: from Latin cynicus, from Greek kunikos; probably originally from Kunosarges, the name of a school where Antisthenes taught, but popularly taken to mean ‘doglike, churlish’, kuōn, kun-, ‘dog’ becoming a nickname for a Cynic.