willowy

This term carries a strong positive connotation, emphasizing elegance and grace rather than mere thinness. While words like skinny or scrawny suggest a lack of health or an unattractive fragility, willowy evokes a sense of fluid, organic beauty and athletic flexibility.

Usage is almost exclusively reserved for describing human physiques or movements. It draws a direct visual parallel to the willow tree, which is known for its long, slender branches that bend without breaking, making the word ideal for describing dancers, gymnasts, or models.