complex

If something is complex, it has lots of parts or pieces, or is difficult to understand.

Example: He has constructed a complex computer system to send translated messages between humans and dolphins.

A problem.

A group of buildings with a common purpose, such as a university or military base.

A psychologically-based dislike or fear of a particular thing.

Example: Jim has a complex about working for a woman boss.

A thunderstorm that forms when two storm fronts collide.