When we say something has been done "in a cursory way," it typically suggests that the task was completed hastily or superficially, without much attention to detail. However, there are several antonyms to describe a more thorough, comprehensive method of performing the same task. Some of these antonyms include meticulously, thoroughly, carefully, methodically, and painstakingly. These words depict a more diligent approach that guarantees better results and a more satisfactory outcome. By using these antonyms, we can better convey the level of effort and attention that went into the task at hand, rather than simply suggesting that it was done hastily or without due consideration.