IPA: //ʌn.æmˈbɪɡ.ju.əs//
KK: /ʌnˈæmbɪɡjuəs/
Describing something that is clear and has only one possible meaning, without any confusion or doubt.
The instructions were unambiguous, making it easy for everyone to understand what to do.
Unambiguous → It is formed from "un-" (meaning not) and "ambiguous" (from Latin "ambiguus", meaning having double meaning or unclear). The word "unambiguous" means not having double meanings or being clear and straightforward.
Think of 'not' ('un-') having 'double meanings' ('ambiguus') — that's why unambiguous means clear and straightforward.