General Opposites:
* Complex: This is a general opposite, meaning intricate, involved, or complicated.
* Difficult: This suggests something challenging to understand or do.
* Intricate: This implies a lot of detail and complexity.
* Elaborate: This emphasizes complexity and detail in design or presentation.
Specific Opposites:
* Sophisticated: This can be used in contrast to simple, especially when talking about taste or design.
* Advanced: This is used when discussing something complex in a technical or academic sense.
* Complicated: This is a more informal way of saying complex.
Examples:
* Simple dress vs. elaborate gown
* Simple math problem vs. advanced calculus
* Simple explanation vs. complicated theory
The best opposite for "simple" depends on the specific situation and the meaning you want to convey.