They aren't synonyms, though they are related concepts: https://english.stackexchange.com/questions/10459/what-is-the-difference-between-complicated-and-complex

They aren't synonyms, though they are related concepts: https://english.stackexchange.com/questions/10459/what-is-the-difference-between-complicated-and-complex https://english.stackexchange.com/questions/10459/what-is-th... I admit the distinction got me at first as it is quite a subtle one but the point made by the parent commenter is valid.