complex - Master This Word
Master this word with our 5-step learning method – Learn English in English
complex Word Meanings
- consisting of many different and connected parts
- difficult to understand or deal with
- a group of similar things that are connected
complex Example Sentences
Example sentences are the start of understanding. Don't rush to memorize. First feel how the word works in a sentence.
complex Phonetic & Pronunciation
UK
/ˈkɒmplɛks/
US
/ˈkɑmplɛks/
complex Word Etymology
com- = together + plex = fold. Originated from Latin 'complexis' → Old French 'compleks' → English. Imagine a tangled ball of yarn, representing how different parts fold together to create complexity.
Note 1: These definitions and etymologies are not standard dictionary definitions, but extended explanations provided to help with memorization and understanding of the actual application of words. Through this background information, we strive to make words more vivid and easier to understand, and help you remember their meanings in real life.
Note 2: LexiTalk designs the learning flow around the linguistics principle of “Comprehensible Input.” When learners encounter material that is slightly above their level but still understandable from context, the brain naturally absorbs the language. That’s why we keep every word inside authentic contexts, using examples and associations to help you understand it and use it flexibly.
Read the FAQ explanation of Comprehensible InputEnglish Brain Route
I lean forward and move a stack of notes on the desk. As I shift one idea, the others adjust, and a line in my head begins to form. The word feels complex not as a rule but as a texture I turn over, letting it settle in my mind. When two plans pull in different directions, I hold them and place them together, watching how they fit.
Real Context
Complex describes things made of many parts that fit together, such as a complex system or a complex building. It also means something that is difficult to understand or deal with because there are many different factors interacting with each other. As a noun, a complex can refer to a group of related buildings or to a psychological construct such as a personality complex. The word comes from Latin com- meaning together and plex meaning fold, via Old French complex into English. Learners should note that complex does not always mean hard in the sense of unpleasant; it often signals structure and interconnection rather than mystery alone. Common collocations include complex system, complex problem, shopping complex, residential complex.
Usage Reminders
- Use as an adjective before a noun; refer to many parts or interactions
- Distinguish between complex and complicated by focus on structure rather than difficulty
- As a noun, use for a group of buildings or a psychological concept
- Pronounce stressing the first syllable: CON-plex
- Common collocations: complex system, complex problem, residential complex, shopping complex
Common Misconceptions
- Complex always means something is hard to understand
- Confuse complex with complicated in all contexts
- Think complex only refers to emotions or psychology
- Mistakenly use complex as a synonym for difficult or troublesome
- Ignore the noun form and use only as an adjective
Thinking Differences
Explain to an English speaker that complex has two main senses, one structural and one evaluative, and that learners often mistake it for complicated based on perceived difficulty rather than the number of parts.
Learning Tips
- Compare complex with simple and with complicated to feel the nuance
- Always check if it modifies a noun or stands as a noun itself
- Use concrete collocations like complex system and complex problem
- Pronounce with stress on the first syllable CON-plex
- Practice with both positive and negative contexts to see nuance
- Watch for the noun form for places like a shopping complex
5-Step Learning Method - Learn English in English
Step 1: Meaning
What is the meaning of the word 'complex'?
A.Interesting
B.Simple
C.Difficult
D.Short
Step 2: Usage
In which of the following sentences is 'complex' used correctly?
A.The problem was very simple to solve.
B.Her emotions were very easy to understand.
C.The computer program had a complex code.
D.He followed the directions with ease.
Step 3: Similar Words
Which word is a synonym of 'complex'?
A.Basic
B.Easy
C.Clear
D.Complicated
Step 4: Opposite Words
Which word is an antonym of 'complex'?
A.Intricate
B.Elaborate
C.Thorough
D.Straightforward
Step 5: Mastery
In what real-life situation might you encounter something 'complex'?
A.Feeding a pet
B.Eating breakfast
C.Taking a nap
D.Building a rocket ship
Related Listening
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