Which of the following best encapsulates the meaning of 'plaintive'?

The term 'plaintive' is derived from the word 'plaint', which is a lament or a mournful expression of sorrow. Therefore, the essence of 'plaintive' lies in conveying an emotional state characterized by sadness or melancholy. It is often used to describe sounds, voices, or expressions that evoke a sense of sadness and longing.

When something is described as plaintive, it typically carries a tone that reflects grief or mourning, making the connection to sorrow explicit. This quality distinguishes it sharply from descriptions that imply happiness, excitement, or lack of emotion. In this context, the other options do not align with the emotive nuance encapsulated by 'plaintive.'