Unpresumptuously is an adverb that describes someone who behaves in a modest and humble way. If you were looking for antonyms for this word, you might consider words like arrogantly, presumptuously, immodestly, boastfully, or haughtily. These words describe behavior that is exactly opposite to being modest and humble. When someone acts arrogantly or presumptuously, they tend to overestimate their own abilities, importance, or worth. Conversely, someone who is behaving unpresumptuously is aware of their limitations, respects others' opinions, and is self-effacing. Remember, when choosing your words, think about how you want to present yourself to the world, and always strive for humility and a healthy sense of modesty.