IPA: /ˌʌnkənˈsɜːrnədnəs/
KK: /ʌnˌkənˈsɜrndnəs/
The state of not being worried or troubled about something.
Her unconcernedness about the exam surprised her friends.
Unconcernedness → It is formed from "un-" (meaning not), "concern" (from Latin "concernere", meaning to sift together or to relate), and "-ed" (indicating a state or condition) combined with "-ness" (meaning the quality of). The word "unconcernedness" refers to the quality of not being concerned or indifferent.
Think of 'not' ('un-') being related ('concern') to something, and the '-ness' indicating a state. This helps you remember that 'unconcernedness' means the state of not being concerned.