IPA: /ˌʌnkənˈsɜːrnɪdli/
KK: /ʌnˈkənˌsɜrnɪdli/
In a way that shows a lack of worry or interest about something.
She unconcernedly walked past the chaos around her.
Unconcernedly → It is formed from "un-" (meaning not) and "concern" (from Latin "concernere", meaning to sift together or to relate). The suffix "-edly" (meaning in a manner) indicates the manner of the action. Thus, "unconcernedly" means to act in a manner that is not related or affected by concern.
Think of 'not' ('un-') being combined with 'relating' ('concern') to remember that 'unconcernedly' means acting without any worry or care.