Which of the following best describes someone who is 'torpid'?

The term 'torpid' refers to a state of physical or mental inactivity, sluggishness, or lethargy. When describing someone as torpid, it implies that they lack energy or enthusiasm. This description aligns with the notion of being dull and sluggish, indicating a person who is not engaged or responsive, either physically or emotionally. The essence of being torpid encompasses a sense of lethargy, where an individual's faculties are diminished, resulting in a slower response to stimuli or a lack of initiative.

In contrast, the other descriptions refer to more active or engaged states. Being active and alert suggests a high level of energy and responsiveness, which is the opposite of torpid. Indifferent and apathetic conveys a sense of lack of interest or care, which shares some similarities but does not necessarily imply sluggishness. Lastly, being curious and lively denotes enthusiasm and eagerness to explore, directly contradicting the idea of torpidity. Thus, the characterization of someone as dull and sluggish accurately captures the essence of what it means to be torpid.