IPA: /ˈmɔɪstli/
KK: /mɔɪstli/
In a way that is slightly wet or damp.
The cake was baked moistly, making it very delicious.
Moistly → It is formed from "moist" (from Old French *moiste*, meaning slightly wet or damp) and "-ly" (meaning in a manner of). The word "moistly" means in a manner that is slightly wet or damp.
Think of something being 'slightly wet' ('moist') and how it is done 'in a manner' ('-ly'). This helps you remember that 'moistly' describes something that is done in a slightly wet way.