(noun, adjective, verb)


1. complicated in structure; consisting of interconnected parts

- a complex set of variations based on a simple folk melody

- a complex mass of diverse laws and customs

Similar word(s): difficult, hard, compound, analyzable, decomposable, byzantine, convoluted, involved, knotty, tangled, tortuous, colonial, compound, complex, complicated, composite, daedal, gordian, interlacing, interlinking, interlocking, interwoven, intricate, labyrinthian, labyrinthine, mazy, multifactorial, multiplex, thickening

2. difficult to analyze or understand

- he's more complex than he seems on the surface

Similar word(s): complex, complicated

Sentences with complex as an adjective:

- a complex being; a complex idea

- complex function


1. a conceptual whole made up of complicated and related parts

- the complex of shopping malls, houses, and roads created a new town

Similar word(s): composite

Definition categories: thought, whole

2. a compound described in terms of the central atom to which other atoms are bound or coordinated

Definition categories: substance, compound

3. (psychoanalysis) a combination of emotions and impulses that have been rejected from awareness but still influence a person's behavior

Definition categories: feeling

4. a whole structure (as a building) made up of interconnected or related structures

Definition categories: man–made, construction, structure

Sentences with complex as a noun:

- Jim has a real complex about working for a woman boss.


1. (chemistry, intransitive) To form a complex with another substance