gradual

Instead, there’s a gradual continuum of genetic variation throughout.

Settlement is usually a gradual process because it takes time for the water to find a path out from the soil matrix.

Slow and gradual, but steady.

He also established an explicit connection between speech and mental concepts, arguing that inner speech develops from external speech via a gradual process of internalization.

If you pay attention, you’ll notice newer roadways are less of a series of straight lines connected by short curves and more of a continuous flow of gradual turns.