It is irregular.
An irregular trapezium.
In the United States, yes its very definition is a general irregular quadrilateral. However, outside the U.S., its the same thing as a trapezoid and there are regular and irregular trapezoids.
Its parallel sides are of different lengths. Its angles are not all the same.
There are heaps but here is a few Square, Rectangle, Diamond, Rhombus, Trapezium, Kite, Parallelogram. Then there is irregular quadrilaterals.
It is irregular.
Irregular
A parallelogram, a rhombus, kites, arrowheads, trapezium and irregular quadrilaterals. However, some kites, arrowheads, trapezium and irregular quadrilaterals can have one (or more) right angles.
An irregular trapezium.
An isosceles trapezium and selected irregular quadrilaterals.
irregular trapezium
In the United States, yes its very definition is a general irregular quadrilateral. However, outside the U.S., its the same thing as a trapezoid and there are regular and irregular trapezoids.
Some kites and irregular quadrilaterals. Certainly not a trapezium or parallelogram.
A trapezium, an irregular pentagon (like a child's drawing of a house with a roof), irregular n-gons of higher order.
Its parallel sides are of different lengths. Its angles are not all the same.
A right trapezium or an irregular quadrilateral.
It could be a trapezium, or an irregular pentagon, hexagon, heptagon etc.