IPA: /ˌʌn.æmˈbɪv.ənt.li/
KK: /ʌnˌæmbɪˈvæləntli/
In a way that is clear and not open to more than one interpretation or meaning.
She expressed her feelings unambivalently, leaving no room for doubt.
Unambivalently → It is formed from "un-" (meaning not), "ambivalent" (from Latin "ambivalens", meaning having mixed feelings), and "-ly" (meaning in a manner). The word means in a manner that is not mixed in feelings or opinions.
Think of 'not' ('un-') having 'mixed feelings' ('ambivalent') — so when something is unambivalent, it is clear and straightforward.