IPA: /ɪnˈkjʊəriəsnəs/
KK: /ɪnˈkjʊəriəsnəs/
The condition of not being interested in learning or knowing about things; a lack of curiosity.
Her incuriousness about the world around her often surprised her friends.
Incuriousness → It is formed from "in-" (meaning not) and "curious" (from Latin "curiosus", meaning eager to know or inquisitive) and the suffix "-ness" (meaning the state of being). The word "incuriousness" refers to the state of being not eager to know or lacking curiosity.
Think of 'not' ('in-') being combined with 'eager to know' ('curious') — that's why incuriousness means a lack of curiosity.