While a fit and strong adult human, willing to endure some injury, might have a chance against a cheetah, the same cannot be said for other big felines. Cheetahs, weighing around 50kg and possessing a lighter build, rely on their claws for traction during sprints rather than for killing. Their bite is comparatively weaker, and their smaller mouths limit their capabilities. Despite being incredibly strong, flexible, and experienced in hunting, a cheetah would likely avoid attacking a human adult if alternative options were available.

However, when it comes to leopards, jaguars, and tigers, the odds of victory for an unarmed person are slim to none. While occasional survival stories exist, there are no accounts of an unarmed individual actually triumphing in a fight against these formidable predators. Tigers, with their massive size and power, can easily overpower and kill a human. Leopards and jaguars, although similar in mass to humans, possess sharp claws, powerful bites, and immense strength. It is important to note that these big cats are accustomed to hunting and preying on creatures larger than humans.

In summary, while a determined and resilient human might stand a chance against a cheetah, the same cannot be said for encounters with tigers, leopards, or jaguars. These big cats possess the necessary tools and instincts to overpower and subdue their prey, making them highly dangerous and challenging to defeat in a direct confrontation.