Brainteasers are puzzles or problems that require you to think outside the box and use your mental prowess to find a solution. However, sometimes we want to take a break from such challenging activities and engage in something more straightforward. Antonyms for the word brainteaser could include 'simple,' 'easy,' 'uncomplicated,' 'mindless,' and 'effortless.' These activities don't require much mental exertion and can be simple and fun, such as watching a movie or playing a game that doesn't require deep thought. These activities can be useful in giving our minds a rest and allowing us to unwind, even if only for a short while.