The act of tricking or deceiving someone; fooling someone into believing something false.
Present participle of 'gull' (to deceive). The '-ing' suffix makes it a gerund or present participle form, dating back to Old English '-ing' marker.
Con artists are master 'gullers'—and modern psychology shows they succeed not by being clever but by exploiting the cognitive biases everyone has, like the tendency to believe first and question later.
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