No brainer is a term used to describe a decision or action that is easy or obvious. There are many synonyms for this term that can be used in various situations. Some of the most common synonyms for no brainer include a slam dunk, a no-brain, a breeze, a cinch, a no-sweat, a piece of cake, a no-worry, a snap, a no-fuss, a no-problem, a no-hassle, a no-stress and a no-sweat. These synonyms highlight the simplicity of the decision or action, emphasizing that it is straightforward and requires little thought or effort. No matter which synonym is used, it conveys the same meaning that the decision or action is an easy one that requires minimal consideration.