what would the word "infamous" be if i were to use it as a noun?

http://dictionary.reference.com/browse/infamous

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The word "infamous" is primarily used as an adjective to describe someone or something that is well-known for being notoriously evil, disgraceful, or notorious. However, to use it as a noun, you can transform it into the noun form "infamy." "Infamy" refers to the state or condition of being infamous, particularly the reputation of being famous for a negative reason or an act of disgrace. To find this answer, you can consult a dictionary or thesaurus, which provide definitions and alternative forms of words. Online dictionaries such as Merriam-Webster or Oxford English Dictionary can also assist in exploring different uses and forms of a word.