What is a synonym for complex?

The best synonym for "complex" depends on the context. Here are some options depending on what aspect of "complex" you want to emphasize:

For intricate or elaborate:

* Intricate

* Elaborate

* Complicated

* Sophisticated

* Involved

* Multifaceted

* Multilayered

* Detailed

* Nuance

For difficult to understand:

* Confusing

* Arcane

* Obscure

* Cryptic

* Abstruse

* Knotty

* Tangled

For having multiple parts or components:

* Compound

* Composite

* Multipartite

* Composite

* Structured

For psychological or emotional:

* Complicated

* Twisted

* Troubled

* Multifaceted

* Conflicted

For a building or structure:

* Elaborate

* Ornate

* Grand

* Majestic

It's important to choose the synonym that best fits the specific meaning you want to convey.