A rectangle is irregular. The only regular rectangle is a square, so any rectangle that is NOT a square is irregular.
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A "regular" polygon has all sides the same length. A "regular" rectangle has all sides the same length, therefore it is also a square. An "irregular" rectangle then would be any rectangle that is not a square.
What I mean is, a rectangle where none of the sides are the same. Like a Scalene triangle, but with a rectangle.
It is a oblong
A rectangle is also a polygon, a parallelogram, and a quadrilateral with four right angles.
"Rectangle" is virtually synonymous with "oblong."