smooth
adj.adj. having a surface that is perfectly flat and even, without any lumps or rough parts. You can also use it to describe a process that happens without any problems.
adj. having an even and regular surface or consistency; free from perceptible projections, lumps, or indentations. Also used figuratively to describe processes or transitions that occur without difficulty or interruption.
The stone feels very smooth after years in the river.
The mechanic sanded the car door until the surface was perfectly smooth and ready for painting.
The transition to the new software system was surprisingly smooth, with minimal downtime and high levels of employee satisfaction during the first week of implementation.
From Middle English smothe, smethe, from Old English smēþe, smōþ, both from Proto-West Germanic *smanþī, of unknown origin. Cognate with Scots smuith (“smooth”), Saterland Frisian smoud (“smooth”), Low German smood and smödig (“smooth, malleable, ductile”), Dutch smeuïg (“smooth”) (from earlier smeudig).
Commonly used to describe textures, liquids, or abstract processes. When used as a verb, it is transitive and often takes the particle 'out'.