Randomness
Part of speech: noun
Definition: The property of all possible outcomes being equally likely. A type of circumstance or event that is described by a probability distribution. A measure of the lack of purpose, logic or objectivity of an event.
Example sentence: There's a lot of randomness in the decisions that people make.
Entropy
Part of speech: noun
Definition: Strictly thermodynamic entropy. A measure of the amount of energy in a physical system that cannot be used to do work.# strictly thermodynamic entropy. A measure of the amount of energy in a physical system which cannot be used to do mechanical work.# A measure of the disorder present in a system.# The capacity factor for thermal energy that is hidden with respect to temperature [http://arxiv.org/pdf/physics/0004055].# The dispersal of energy; how much energy is spread out in a process, or how widely spread out it becomes, at a specific temperature. [http://www.entropysite.com/students_approach.html]A measure of the amount of information and noise present in a signal.The tendency of a system that is left to itself to descend into chaos.
Example sentence: If you look at life with any honesty and intelligence, it's clear that human nature is dark, vile, selfish, and despondent. But I also see a force in human nature, namely grace, that sometimes works against our natural moral entropy.