IPA: /ˈsɪmpl/
KK: /ˈsɪmpəl/
Easy to understand or do; not complicated or difficult.
The instructions for the game are simple and clear.
Comparative: simpler
Superlative: simplest
A person who is not very intelligent or is easily deceived; a fool.
He was considered a simple by his peers due to his lack of understanding.
Simple → It is formed from "simplus" (from Latin, meaning single or onefold) and the suffix "-e" (used in adjectives). The word "simple" means something that is single or uncomplicated, lacking complexity.
Think of something that is 'single' or 'onefold' — that's why simple means uncomplicated or straightforward.