IPA: /nɒnˈlɛvəl/
KK: /nɑnˈlɛvəl/
Not flat or even; having an uneven surface or height.
The ground was nonlevel, making it difficult to set up the tent properly.
Comparative: more nonlevel
Superlative: most nonlevel
Nonlevel → It is formed from "non-" (meaning not) and "level" (from Old French *level*, meaning flat or even). The word "nonlevel" means not flat or uneven.
Think of 'not' ('non-') and 'flat' ('level') to remember that 'nonlevel' describes something that is not flat.