What term might be used to describe an event or situation that takes a toll on one's energy and spirit?

The term that best describes an event or situation that takes a toll on one's energy and spirit is grueling. This word specifically refers to something that is extremely tiring and demanding, often requiring a significant amount of physical or mental effort that can lead to exhaustion. When an experience is grueling, it implies a challenging nature that drains energy, both physically and emotionally, leaving one feeling worn out.

In contrast, the other options suggest positive or neutral experiences. Relaxing refers to activities that help one unwind and recharge, invigorating implies something that energizes and revitalizes one’s spirit, while comfortable denotes ease and comfort without exertion. Thus, none of these adequately convey the taxing nature of a grueling experience, making it the most appropriate choice for describing a situation that depletes energy and spirit.