IPA: /ʌˈniːvənli/
KK: /ʌˈnivənli/
In a way that is not equal or regular; not uniform or smooth.
The paint was applied unevenly, leaving some areas darker than others.
Unevenly → It is formed from "un-" (meaning not) and "even" (from Old English "efen", meaning level or equal) and the suffix "-ly" (meaning in a manner). The word "unevenly" means not in a level or equal manner.
Think of 'not' ('un-') being added to 'level' ('even') to remember that 'unevenly' describes something that is not level or equal.