IPA: //ʌˈniːvənɛst//
KK: /ʌˈnivənɪst/
Not level or smooth; having an irregular or varied surface or quality.
The road was unevenest in the winter, making it difficult to drive safely.
Comparative: more uneven
Superlative: unevenest
Unevenest → It is formed from "un-" (meaning not) and "even" (from Old English "efen", meaning level or equal) and the superlative suffix "-est" (meaning most). The word "unevenest" means the most not level or the most unequal.
Think of 'not level' ('un-') and 'equal' ('even') to remember that 'unevenest' describes something that is the most unequal.