Inofficiously is a rarely used and highly formal word that means "without benefit or advantage." Synonyms for inofficiously include ineffectively, fruitlessly, unproductively, uselessly, and pointlessly. These words suggest a lack of success in achieving one's goals or objectives. Furthermore, words such as disadvantageously, unprofitably, wastefully, and unsuccessfully may also be used in place of inofficiously. Each of these words conveys the same idea that something has been done or achieved in a way that did not lead to success. In everyday speech, it's more common to use simpler, less formal words to describe a lack of benefit.