What is the Antonym of complex?

The antonym of "complex" depends on the context. Here are a few possibilities:

If "complex" refers to something intricate or complicated:

* Simple

* Basic

* Straightforward

* Easy

* Uncomplicated

If "complex" refers to something made up of many parts:

* Single

* Unified

* Whole

* Singular

If "complex" refers to a psychological complex:

* Simple

* Normal

* Healthy

* Balanced

Example:

* Complex problem: Simple solution

* Complex system: Basic mechanism

* Complex personality: Simple nature

It's important to consider the specific meaning of "complex" in the context of your sentence to choose the most appropriate antonym.