Mulled over refers to carefully thinking about something, contemplating or pondering over a matter. The antonyms for mulled over include rushed, skimmed, overlooked, neglected, and dismissed. Rushed refers to making hasty and quick decisions without appropriate reflection or thought. Skimmed means to read or look through quickly without a deep understanding of a matter. Overlooked refers to neglecting to notice or consider something. Neglected means to ignore or pay no attention to a matter. Dismissed means to reject or disregard something with contempt or disdain. Using antonyms of "mulled over" can help to contrast the idea of thoughtful deliberation against actions that lack careful consideration or reflection.