IPA: /ˈsiːdɪli/
KK: /ˈsiːdɪli/
In a way that is shabby, disreputable, or morally questionable.
The hotel was seedily decorated, with peeling wallpaper and dim lighting.
Seedily → It is formed from "seed" (from Old English *sǣd*, meaning the reproductive part of a plant) and "-ily" (a suffix used to form adverbs meaning in a manner of). The word "seedily" means in a manner that is related to or resembles seeds, often implying a sense of being seedy or shabby.
Think of 'seed' as the part of a plant that can grow, and remember that 'seedily' describes something that is done in a shabby or disreputable manner, like a neglected seed.