(archaic) One falsely claiming to possess medical or other skills, especially one who dispenses potions, ointments, etc., supposedly having curative powers; a quack.
quakerishly
quakinesses
quicknesses
quicknesses
noun
plural of quickness
quicksilver
quicksilver
adj
Unpredictable, erratic or fickle; mercurial.
noun
(colloquial) An amalgam of mercury and tin applied to the backs of mirrors, quicksilvering.