IPA: /ʌnˈkliːn.nəs/
KK: /ʌnˈklɪn.nəs/
The condition of being dirty or not clean.
The uncleanness of the room made it uncomfortable to stay in.
Uncleanness → It is formed from "un-" (meaning not) and "clean" (from Old English *clæne*, meaning free from dirt or impurities) and "-ness" (meaning the state or quality of). The word "uncleanness" refers to the state of being not clean or dirty.
Think of 'not' ('un-') being added to 'clean' to describe a state of being dirty or impure.