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Definitions

complex

[kuhm-pleks, kom-pleks, kom-pleks] / kəmˈplɛks, ˈkɒm plɛks, ˈkɒm plɛks /
ADJECTIVE
involved, intricate
Synonyms
STRONGEST
complicated convoluted
STRONG
composite compound conglomerate manifold mosaic motley multiple multiplex
WEAK
circuitous compounded confused elaborate entangled heterogeneous knotty labyrinthine mingled miscellaneous mixed mixed-up multifarious multiform tangled tortuous variegated
Antonyms
STRONGEST
simple
STRONG
single uniform unmixed
WEAK
apparent clear direct discernible easy evident homogeneous obvious plain
ADJECTIVE
difficult to understand
Synonyms
STRONGEST
complicated convoluted disturbing intricate obscure perplexing sophisticated
STRONG
byzantine winding
WEAK
Daedalean Gordian abstruse bewildering circuitous confused crabbed cryptic discursive disordered enigmatic entangled excursive hidden impenetrable inscrutable interwoven involved jumbled knotted knotty labyrinthine mazy meandering mingled mixed muddled paradoxical puzzling rambling recondite round-about sinuous snarled tangled tortuous undecipherable unfathomable
Antonyms
STRONGEST
easy simple
WEAK
apparent clear direct discernible evident homogeneous obvious plain uniform
NOUN
composite, aggregate
Synonyms
STRONGEST
compound network structure system
STRONG
association conglomerate ecosystem entanglement group organization scheme syndrome synthesis totality
Antonyms
STRONG
division separation
NOUN
psychological problem
Synonyms
STRONG
anxiety fear fixation hang-up insanity mania neurosis obsession phobia preoccupation repression
WEAK
a thing about something exaggerated reaction fixed idea idée fixe
Antonyms
STRONG
balance sanity

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

My wife hated the apartment complexes we had bought over the years, and we sold our last apartment complex, quit our jobs and have been living on our savings and investments since then.

From MarketWatch • Apr. 22, 2026

The planet, known as Epsilon Indi Ab, is similar to Jupiter, yet its atmosphere appears more complex than expected.

From Science Daily • Apr. 22, 2026

A controversial housing and hotel complex that will stand out on Santa Monica Boulevard in West Hollywood got the go-ahead from the City Council.

From Los Angeles Times • Apr. 22, 2026

It targeted Ahmed Maeleninine, an Islamic State group recruiter who was hiding out in a cave complex in Somalia.

From Salon • Apr. 22, 2026

She set up a meeting for me with the activities director at her senior citizen complex.

From "Shine!" by J.J. and Chris Grabenstein

Vocabulary lists containing complex

Academic Vocabulary: Core Tier 2 Words, List 2

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The Catcher in the Rye

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Vocabulary from "Stop Expecting Games to Build Empathy" by Julie Muncy

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