slendernessсуществительное The quality or state of being thin or narrow in form. The slenderness of the tree trunks made them sway easily in the wind.
The quality of being gracefully thin, often in a way that is considered attractive. Her slenderness was admired by many, as she moved with an elegant grace.
In engineering, the ratio of the effective length of a structural member to its least radius of gyration, indicating its tendency to buckle. The column's slenderness must be checked to ensure it can carry the design load without buckling.