Entropies refer to the measure of disorder or randomness in a system. Its synonyms include chaos, disorganization, confusion, turbulence, instability, and unpredictability. These words embody the concept of a system that is no longer in equilibrium. Other synonyms include complexity, irregularity, and disorderliness. Entropy may also indicate the tendency towards a less ordered state or a less efficient use of energy. Other words that closely relate to entropy include decay, deterioration, degeneration, and decline. In short, any system in chaos, disarray, or lacking structure is a good example of entropy, and any words that convey such a sense of randomness are synonyms for entropy.