After running 10 miles, bicycling 20 miles, and swimming 10 miles, the triathlete was overcome with lassitude — a great weariness or lack of energy.
Lassitude might sound like latitude, but the two words don't mean the same thing. Latitude describes the distance of a particular location from the equator. Lassitude is the weariness you'd experience after attempting to run a marathon around the equator. Lassitude can also describe a lack of interest, like deciding you'd rather lie on your couch or run that marathon at the equator.
