complicated
US /ˈkɑːm.plə.keɪ.t̬ɪd/
UK /ˈkɑːm.plə.keɪ.t̬ɪd/

1.
involving many different and confusing aspects
:
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The instructions were too complicated for me to follow.
•
It's a very complicated issue with no easy solution.
2.
difficult to understand or explain
:
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The plot of the movie was too complicated for me to follow.
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His explanation was so complicated that nobody understood it.