ENTROPY

a measure of the unavailable energy in a closed thermodynamic system that is also usually considered to be a measure of the system's disorder, that is a property of the system's state, and that varies directly with any reversible change in heat in the system and inversely with the temperature of the system

broadly : the degree of disorder or uncertainty in a system.

Merriam-Webster. (n.d.). Entropy. dictionary.

Protagonist model: "Billy" by Ambroise Nicolao (@Amb) (CC BY 4.0)