The phrase "more deliberately" suggests taking a slow, thoughtful approach towards a task or decision. Antonyms for this phrase would describe a quicker or more impulsive method. Words like rashly, haphazardly, recklessly or hurriedly describe actions taken without much thought or consideration. Acting on a whim, without a plan or strategy, could also be an antonym for acting more deliberately. The opposite of taking it slow and being careful, would be rushing or taking shortcuts. In conclusion, while acting more deliberately implies a mindful approach, antonyms like impulsively or hastily suggest a careless or reckless approach.