A trapezoid has to have one pair of parallel lines, right? If a shape isn't a trapezoid because it has no parallel lines, no equal sides, but has four sides, what is it? The question wanted the best descriptive name.

quadrilateral? (literally meaning four-sided)

Oh. ok. thanks.

If a shape has no parallel lines, no equal sides, but does have four sides, it is known as a quadrilateral. A quadrilateral is a general term for a polygon with four sides and four angles. Since it doesn't have any parallel lines or equal sides, there is no specific name that describes it more specifically. However, the term quadrilateral is a suitable and descriptive name for such a shape.