IPA: /ˌʌn.rɪˈliː.vɪd.li/
KK: /ʌnˈrɪlivɪdli/
In a way that is complete and without any relief or break; totally and continuously.
She worked unrelievedly on her project until it was finished.
Unrelievedly → It is formed from "un-" (meaning not), "relieved" (from Latin "relievare", meaning to raise up or alleviate), and "-ly" (meaning in a manner). The word "unrelievedly" means in a manner that is not alleviated or without relief.
Think of 'not' ('un-') alleviating or raising up ('relievare') something, which helps you remember that 'unrelievedly' means without any relief.