Final answer:
Etching is the form of intaglio printing most similar to drawing, as it allows for fluid lines and tonal variations akin to traditional drawing techniques.
Step-by-step explanation:
The form of intaglio printing that is most similar to drawing is etching. Unlike engraving, which requires the use of a burin to cut into the metal plate, etching involves drawing on the plate with a protective coating and then using a mordant to etch into the exposed metal.
This process is much closer to the act of drawing since it allows for more fluid lines and a greater range of tonal variations, resembling the techniques used with pencil or ink on paper.