IPA: /ˌʌn.rɪˈlʌk.tənt/
KK: /ʌnˈrɪlʌktənt/
Not hesitant or unwilling; ready to do something without reluctance.
She was unreluctant to help her friend with the project.
Unreluctant → It is formed from "un-" (meaning not) and "reluctant" (from Latin "reluctari", meaning to struggle against). The word "unreluctant" means not struggling against something, or being willing.
Think of 'not' ('un-') struggling against something ('reluctant') — that's why unreluctant means being willing or ready.