1 [more complex; most complex] : having parts that connect or go together in complicated ways
▪ a complex system ▪ The house's wiring is complex. 2 [more complex; most complex] : not easy to understand or explain : not simple
▪ a complex problem ▪ The situation is more complex than you realize. ▪ Her poetry is too complex [=complicated] for my taste. 3 grammar : consisting of a main clause and one or more additional clauses
▪ a complex sentence
▪ a complex system ▪ The house's wiring is complex.
▪ a complex problem ▪ The situation is more complex than you realize. ▪ Her poetry is too complex [=complicated] for my taste.
▪ a complex sentence
— com·plex·ly adverb
▪ The rules are complexly written.
▪ The rules are complexly written.





