IPA: /ʌnˈwɪlɪŋli/
KK: /ʌnˈwɪlɪŋli/
In a way that shows reluctance or lack of desire to do something.
She agreed to help him, but she did it unwillingly.
Unwillingly → It is formed from "un-" (meaning not) and "willing" (from Old English "willan", meaning to wish or desire) and the suffix "-ly" (meaning in a manner). The word "unwillingly" means in a manner that is not desired or wished for.
Think of 'not' ('un-') wanting to do something ('willing') — that's why 'unwillingly' means doing something against your desire.