languid

The word "languid" describes a lack of energy, strength, or activity. It can refer to a person feeling weak or sluggish, or to a market or pace of life that is slow and unhurried. It is often associated with feelings of dissatisfaction or sadness, leading to a listless disposition.1

In the context of a pipe organ, a "languid" refers to a specific part of a flue pipe. This flat plate divides the foot of the pipe from its speaking length. The wind enters through a narrow slit called the flue and strikes the upper lip, creating sound. The pitch of the note is determined by the length of the pipe, with longer pipes producing lower notes.2