IPA: /ˌʌn.kənˈsɜrn/
KK: /ʌnˈkənˌsɜrn/
A state of not being worried or interested in something; a feeling of indifference or lack of care.
His unconcern about the upcoming exam surprised his friends.
Unconcern → It is formed from "un-" (meaning not) and "concern" (from Latin "concernere", meaning to sift together or to relate). The word "unconcern" means a state of not being worried or involved in something.
Think of 'not' ('un-') being involved or worried about something ('concern'). This helps you remember that 'unconcern' means a lack of worry or involvement.