Synonyms for

Complex

Verb / ˈkɑ:mpleks / / kʌˈmpleks / Another word for complex — explore alternatives below. For syllable breakdowns and pronunciation, see this word on Syllablesworld.

Definition

Complicated or difficult to understand

Synonyms & similar words

buildingcomplex coordinationcompound simple composite complicated intricate difficult involved convoluted puzzling perplexing baffling challenging tricky knotty problematic confusing obscure abstruse arcane esoteric complicated sophisticated complexity

Synonyms by register

Formal

intricate complicated involved sophisticated

Informal

tricky tough hard messy

Literary

convoluted labyrinthine Gordian

Antonyms

simple easy plain straightforward uncomplicated obvious clear

Common collocations

  • complex issue
  • complex problem
  • complex system
  • complex organism
  • complex relationship
  • complex structure
  • complex emotions
  • complex situation

Word family

noun complexity
adjective complex
adverb complexly

Usage note

While 'complex' can be used informally, it is often preferred in more formal or technical contexts. Be mindful of its common use as an adjective, but note it can also be a noun referring to a group of related things, especially buildings.

Example sentences

  1. The instructions were so complex that I had to ask for help.
  2. The science experiment was too complex for us to do without adult supervision.
  3. The new video game was very complex and took a long time to learn.
  4. The citys traffic system is quite complex and difficult to navigate.
  5. The human brain is one of the most complex organs in the body.

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