There are various synonyms for the term "in curves" that can be used to describe the shape or movement of an object. Some alternatives to this phrase include "wavy," "twisted," "serpentine," "curvaceous," or "sinuous." These words can be used to describe physical characteristics of objects such as roads, rivers, or even hair. Additionally, the phrase "in undulations" or "undulating" can also mean to follow a smooth, wave-like pattern. Whether referring to the appearance or movement of an object, these synonyms for "in curves" can add more detail and description to any piece of writing.