IPA: /ˌʌn.əmˈbɪɡ.ju.əs.li/
KK: /ʌnˈæmbɪɡjuəsli/
In a way that is clear and leaves no room for confusion or doubt.
The instructions were unambiguously stated, so everyone understood what to do.
Unambiguously → It is formed from "un-" (meaning not) and "ambiguous" (from Latin "ambiguus", meaning having double meanings or unclear). The word "unambiguously" means in a way that is not open to more than one interpretation or is clear and definite.
Think of 'not' ('un-') being added to 'ambiguous', which means unclear. This helps you remember that 'unambiguously' means something is clear and definite.