IPA: /ʌnˈmɪtɪɡeɪtɪdli/
KK: /ʌnˈmɪtɪˌɡeɪtɪdli/
In a way that is absolute or complete, without any reduction or limitation.
The project was an unmitigated success, exceeding all expectations.
Unmitigatedly → It is formed from "un-" (meaning not) and "mitigated" (from Latin "mitigare", meaning to soften or lessen) and the suffix "-ly" (meaning in a manner). The word means in a manner that is not softened or lessened, indicating something that is absolute or complete.
Think of 'not' ('un-') softening or lessening something ('mitigated') — that's why unmitigatedly means something is absolute or complete.