IPA: /ˈlɒpˌsaɪdɪdli/
KK: /ˈlɑːpˌsaɪdɪdli/
In a way that is not even or balanced, often leaning to one side.
The picture hung lopsidedly on the wall, making it look awkward.
Lopsidedly → It is formed from "lop" (from Middle English *loppe*, meaning to hang down or droop) and "sided" (meaning having a side) combined with the adverbial suffix "-ly" (meaning in a manner). The word "lopsidedly" means in a manner that is uneven or not balanced on one side.
Think of something that is 'hanging down' ('lop') on one side, making it 'uneven' or 'not balanced' — that's what lopsidedly means.
No commonly confused words.