Antonyms for the phrase "in or with the manner" include clumsily, awkwardly, haphazardly, randomly, unprofessionally, carelessly, and sloppily. These words indicate a lack of skill, attention to detail, and a disregard for proper execution. When one does something "in or with the manner," they are doing it proficiently and with poise. Conversely, when done clumsily or carelessly, it is likely to result in errors or cause a negative outcome. Therefore, it is important to avoid doing things in an unprofessional or careless manner and strive to execute tasks with the utmost precision and expertise.