The word "lousily" means poorly, badly or shoddily. Its antonyms are words that have the opposite meaning of it. Instead of lousily, one could say excellently, greatly or superbly. Magnificently, outstandingly and brilliantly could also be used as antonyms for lousily. Precisely, perfectly or flawlessly are more antonyms for lousily that can be used in certain contexts. Similarly, words like impressively, beautifully, and skillfully are also antonyms of lousily in certain situations. Lousily is a common term that can be swapped out for more positive words to elevate the tone of the text.