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.

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

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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.

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Composed of interconnected parts; formed by a combination of simple things or elements; including two or more connected particulars; composite; not simple: as, a complex being; complex ideas; a …

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.

A whole composed of interconnected or interwoven parts. A complex of cities and suburbs; the military-industrial complex.