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IELTS word

complex

/ˈkɑmplɛks/adjective

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English definition

made of many connected parts; hard to understand

Common phrases / collocations

  1. complex problem
  2. complex system
  3. highly complex

Example sentences

  1. 1.

    The engineer studied the complex machine.

  2. 2.

    The report explains a complex problem.

  3. 3.

    The human brain is a complex system.

Visual learning

See the meaning

An engineer examines a machine full of connected gears and pipes.
made of many connected parts; hard to understand
1many parts
2work together
many parts→work together