The quality or state of being contrary to the laws of nature and physics.
From antiphysical + -ness (suffix creating abstract nouns). This nominalization takes the adjective describing violations of physics and makes it an abstract concept or property.
The '-ness' suffix is a magic tool in English that turns adjectives into abstract nouns—'antiphysicalness' becomes the property itself, letting philosophers discuss the 'quality of being unnatural' as a standalone idea.
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