Longman Dictionary of Contemporary English homepage

complicated

 adjective
     
com‧pli‧cat‧ed S2
1 difficult to understand or deal with, because many parts or details are involved [= complex]:
a complicated voting system
For young children, getting dressed is a complicated business.
very/extremely/immensely/highly etc complicated
Mental illness is a very complicated subject.
2 consisting of many closely connected parts [= complex]:
a complicated pattern
The human brain is an incredibly complicated organ.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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