IPA: /ʌnˈnætʃərnəs/
KK: /ʌnˈnætʃərnləs/
The condition of not being natural or normal; something that is artificial or forced.
The unnaturalness of the scene made it feel like a movie set rather than a real place.
Unnaturalness → It is formed from "un-" (meaning not) and "natural" (from Latin "naturalis", meaning of nature) and "-ness" (meaning the state of being). The word "unnaturalness" refers to the state of not being natural or contrary to nature.
Think of 'not' ('un-') being applied to something 'of nature' ('natural'), and then adding a suffix that indicates a state. This helps you remember that 'unnaturalness' means the state of being not natural.