The phrase "dumb fun" means something is entertaining or enjoyable without requiring much thinking or intelligence. It refers to simple, mindless, and lighthearted amusement. Full definition
These sequences are the epitome of dumb fun with the realization that that's all they are. (moviemanjackson.com)
Those two things alone might have been more than enough for big dumb fun, and yet there's so much more. (flickfilosopher.com)
It's a simple shooter that manages to provide dumb fun in decent quantities, if you can overlook how poorly it aged in the visual and sound departments. (waytoomany.games)