B1adjectiveacademicscience
US/kɑːmˈpleks/
UK/ˈkɒm.pleks/
having many parts that are connected, so it is hard to understand
In context
Climate change is a complex problem with no easy answer.
The instructions were too complex for most users.
The human brain is a very complex organ.
Words that go with complex
adjective + noun
- complex problemTraffic is a complex problem in big cities.
- complex issueImmigration is a complex issue.
- complex processMaking silk is a complex process.
adverb + adjective
- highly complexThe system is highly complex.
- increasingly complexPhones are becoming increasingly complex.