The antonyms for the word "indefatigabilities" are many and varied. Some possible antonyms might include "laziness," "apathy," "lack of motivation," "disinterest," "indolence," "slothfulness," "inactivity," "lethargy," and "listlessness." Each of these words represents a distinct lack of energy, persistence, or determination, which are the hallmark traits of someone who possesses indefatigability. While some people may naturally possess this quality, others may need to work to cultivate it through a combination of discipline, focus, and perseverance. Ultimately, the key to embodying indefatigability is to remain committed to your goals and to stay motivated, even in the face of adversity.