You need to know the lengths of the sides and at least one angle or the length of a diagonal.
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a quadrilateral trapezoidA polygon with four unequal sides is a quadrilateral, as is a square, rectangle, trapezoid and parallelogram.
A shape with four unequal sides is called an irregular quadrilateral.
The polygon with four unequal sides is known as a trapezium. Outside of North America is called a general irregular quadrilateral.
A rhombus would fit the given description.
A polygon whose sides are not equal is known as an irregular polygon. A regular polygon has equal sides and angles.