What are the opposite words for stoutness?

Stoutness refers to a person's physical appearance, which is characterized by a heavy and bulky body. The term is often associated with weight gain, obesity, and an unhealthy lifestyle. Contrarily, there are several antonyms for the word stoutness that denote fitness, agility, and wellbeing. Words like slenderness, leanness, thinness, and trimness indicate a lean and fit physique. Unlike stoutness, these antonyms have a positive connotation and are associated with an active and healthy lifestyle. Other antonyms of stoutness include agility, nimbleness, deftness, and flexibility, which signify a person's ability to move freely and smoothly, without any kind of restraint or difficulty.