IPA: //ʌˈnɜːrɪŋli//
KK: /ʌˈnɜrɪŋli/
In a way that is completely accurate and without any errors.
She unerringly found her way back home, even in the dark.
Unerringly → It is formed from "un-" (meaning not) and "erring" (from the root "err" which comes from Latin "errare", meaning to wander or stray) and the suffix "-ly" (meaning in a manner). The word "unerringly" means in a manner that does not stray or make mistakes.
Think of 'not straying' ('un-') and 'wandering' ('err') to remember that 'unerringly' means doing something without making mistakes.