The word 'cant' commonly refers to the insincere, especially conventional expressions or phrases that are often used in a particular profession or group to convey a superficial meaning. It's often associated with jargon or language that may be obscure to outsiders, and can carry a negative connotation of being insincere or pretentious.
The word 'cant' originates from the late 14th century, derived from the Middle French 'canter,' meaning "to sing" or "song." The term evolved to mean the insincere talk often associated with beggars and later came to describe the specialized language of various professions, particularly in the context of moral posturing.