complex, complicated, intricate, involved, knotty mean having confusingly interrelated parts. complex suggests the unavoidable result of a necessary combining and does not imply a fault or failure.

COMPLEX definition: composed of many interconnected parts; compound; composite. See examples of complex used in a sentence.

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COMPLEX definition: 1. involving a lot of different but related parts: 2. difficult to understand or find an answer to…. Learn more.

Complex should be used to say that something consists of several parts rather than that it is difficult to understand, analyse, or deal with, which is what complicated inherently means.

an intricate or complicated association or assemblage of related things, parts, units, etc.: the entire complex of our educational system; an apartment complex.

Her poetry is too complex [= complicated] for my taste. The rules are complexly written. She has a complex about her appearance.