"Vertilinear" is a word in ENGLISH

A line which approaches nearer to some curve than assignable distance, but, though infinitely extended, would never meet it. Asymptotes …

Not direct; not straight or rectilinear; deviating from a direct line or course; circuitous; as, an indirect road.

matádlung - Straight, straight-forward, direct, right, rectilinear, honest, frank. (tádlung).

Straight; consisting of a straight line or lines; bounded by straight lines; as, a rectineal angle; a rectilinear figure or …