IPA: /ˈmɔɪstnəs/
KK: /mɔɪstnəs/
The quality or state of being slightly wet or damp.
The moistness of the soil is important for the growth of plants.
Moistness → It is formed from "moist" (from Old French *moiste*, meaning slightly wet or damp) and "-ness" (meaning the state or quality of). The word "moistness" refers to the state of being slightly wet or damp.
Think of the word 'moist' which means slightly wet, and remember that 'moistness' describes the quality of being moist.