(A) now means a person easily bamboozled, one of slow wit; but originally it meant one who cheated or bamboozled To duff =to cheat Persons who sell inferior goods as "great bargains," under the pretence of their being smuggled, are duffers; so are hawkers generally At the close of the eighteenth century passers of bad money were so called Now the word is applied to persons taken in, and by artists to inferior pictures "Robinson a thorough duffer is " Alexander Smith: Summer Idyll Duglas the scene of four Arthurian battles It is a river which falls into the Ribble Mr Whittaker says, "six cwt of horse-shoes were taken up from a space of ground near the spot during the formation of a canal "
{i} failure, loser, incompetent person; clumsy person; dunce, person who is not intelligent; (Slang) something that is worthless or useless (Archaic); peddler of worthless goods
In the vernacular of Canoe Country, the third person in a canoe One who sits on one's "duff" while one's partners do the paddling Great work if you can get it
disapproval If you describe someone as a duffer, you mean that they are very bad at doing something. someone who is stupid or not very good at something (Perhaps from doofart )