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General definition
Lookism is a form of discrimination of individuals, which is based on their outward appearance. The term lookism is meant to designate the hierarchization of individuals on the basis of bodily traits, which are rated positively or negatively and therefore enlarge or diminish an individual's perception of certain traits as positive or negative with regard to one's appearance depends on various factors, e.g. a particular concept of gender roles.
Human nature maybe?