IPA: /ˈstreɪndʒnəs/
KK: /ˈstreɪndʒnəs/
The quality or condition of being unusual or different from what is normal.
The strangeness of the situation made everyone feel uneasy.
Strangeness is formed from "strange" (from Old French *estrange*, meaning foreign or unfamiliar) and "-ness" (meaning the state or quality of). The word "strangeness" refers to the quality of being strange or unfamiliar.
Think of something that is 'foreign' or 'unfamiliar' ('strange') and how that quality ('-ness') makes it feel odd or different.