To help you avoid using the same word too repetitively, redundantly, recurrently, incessantly, etc., etc.
Why synonyms can be useful
Your writing can sound boring if you continually keep repeating the same words. When you create sentences, you can make them more interesting by using words that mean the same as the word you are speaking about. This allows you to add flavor to your writing.
In order to make language a lot more expressive and interesting you should try to vary the words you use as often as you can.
Hypernyms:simple, simpletonDefinition: a person lacking intelligence or common sense
Synonyms for (adjective) imbecile
Synonyms:idiotic, imbecile, imbecilicDefinition: having a mental age of three to seven years
Hypernyms:retardedDefinition: relatively slow in mental or emotional or physical development Usage: providing a secure and sometimes happy life for the retarded