Brain twister is a term that is commonly used to describe a difficult or puzzling problem. However, there are several antonyms to this phrase that can be used to describe a task or problem that is easy and straightforward. Some of the antonyms for brain twister are simple, straightforward, easy, uncomplicated, and manageable. A simple task or problem may not require much thought or effort to solve. On the other hand, straightforward means that a problem is easy to understand and clear-cut. Easy refers to a task or problem that can be solved without much difficulty. Uncomplicated suggests that a problem is not complex or convoluted. Lastly, manageable denotes that a problem can be dealt with easily and effectively.