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1. A man who exploits the vulnerability of others for his own sake by manipulating and taking advantage of their confidence (the act of which is known as a confidence trick or game). It is the common abbreviation of the full term, "confidence man." Be wary of con men who send emails claiming to be a bank or some other trustworthy establishment: they often ask for your personal bank details so as to have access to your finances.
2. By extension, a man who is skilled at duplicity, cajolery, or self-serving manipulation or persuasion. John is such a con man, always convincing others to pay for him on nights out under the pretense that he'll "pay them back later."
con manand con artist
n. someone who makes a living by swindling people. Gary is a con artist, but at least he’s not on the dole. I was taken by a real con man!