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Easy to understand or do; If something is simple, it is not complicated, and is therefore easy to understand or do. Not involved or complicated; Simple, foolish, silly, fatuous, asinine mean actually or apparently deficient in intelligence. Simple refers to something thats easy and uncomplicated, without too many steps to follow. Easy to understand or do: Simple implies a degree of intelligence … Used to describe the one important fact, truth…. A simple problem.