What is the difference between a uniform rectilinear movement and an uneven rectilinear movement?

What is the difference between a uniform rectilinear movement and an uneven rectilinear movement? What can be the difference between two rectilinear uniform movements?

With uniform rectilinear movement for equal time intervals, movement occurs at the same distance. If the movement is uneven, then for the same time intervals, the movements will be uneven. The degree of unevenness is determined by acceleration (it can be constant, then the movement is uniformly accelerated, or unstable).

Rectilinear uniform movements can occur at different speeds, in different directions, because displacement is a vector quantity.