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A general quadrilateral: it has no specific name.
The general name for a plane shape with four sides is a quadrilateral.
In a 3D world with 6 sides it is a cube.
There is no specific name, except in the case of a triangle: scalene. You should not call it simply an irregular polygon, because a regular polygon implies that ALL sides are equal and ALL angles are equal. So a rhombus, where all four sides are equal, is still irregular.
The answer is irregular * * * * * That is not true. A rhombus is irregular but does have equal sides. Any shape with equal sides - other than an equilateral triangle - can be distorted so that its angles are not equal. That is enough to make it irregular, even though the sides remain of the same length. There is no specific name for such shapes.