"one who has but slight or superficial knowledge," 1510s, agent noun from smatter (v.).
Examples from the Web for smatterer
He was a smatterer of that most dangerous kind, who feel certain they have arrived at truth.
Like Mr. Stevenson's smatterer, who was asked, "What would be the result of putting a pound of potassium in a pot of porter?"Adventures in Criticism|Sir Arthur Thomas Quiller-Couch
At this explanation she shook her head, and observed that no smatterer could read as I had done.The Adventures of Roderick Random|Tobias Smollett
Any mere sciolist, any empiric, any smatterer of the new medical course—and where would Frank Gilham's arm be now?Perlycross|R. D. Blackmore
Don't spare study; if you will be a lawyer, become a good one, not a smatterer.Lewis Rand|Mary Johnston