Drilliola difficilis is a species of sea snail, a marine gastropod mollusk in the family Borsoniidae.

[2] (Original description) The shell has a shortly fusiform shape and has a brownish horn-colour.

The lines of growth are moderately distinct, raised, flexuous, and more or less oblique.

The nucleus (or the three apical whorls) is smooth, glassy, shining, convex.

The columella is brown, coated with a smooth enamel, oblique below the middle.