Use 'facile' when something is not only easy but also uncomplicated and can be done without much effort. Solving a basic addition problem is a facile task.
Pro Tip 2/3
Positive Connotation
'Facile' often has a positive tone, suggesting that the ease is satisfying or advantageous. She found a facile solution that saved the company time and money.
Pro Tip 3/3
Not Always Good
Be cautious; sometimes 'easy' may not be ideal, such as when complexity is necessary for depth. The teacher's facile explanation failed to cover the subject's depth.