IPA: /ˌʌnˈwɜːrɪd/
KK: /ʌnˈwɜːrɪd/
Not feeling any concern or anxiety about something.
She was unworried about the exam results because she had studied hard.
Unworried → It is formed from "un-" (meaning not) and "worried" (from Old English "wyrgan", meaning to strangle or to cause distress). The word "unworried" means not feeling distress or anxiety.
Think of 'not' ('un-') feeling 'distress' ('worried') — that's why unworried means you are free from worry.