If you have adjacent sides that are congruent and you don’t have any parallel sides, it’s like you are dealing with a shape that has some congruent sides but isn’t necessarily a specific type of quadrilateral like a parallelogram.
Therefore, without more specific information about the shape, it’s difficult to provide a definitive answer. If you have a specific shape in mind or additional details, please share them , and I’d be happy to assist you further.