complicated
gb/kˈɑmplɪkˌeɪtɪd/ us/kˈɑmplɪkˌeɪtɪd/
B1
英語
語義
0件の語義
adjective
B1
property
1
hard to understand or explain
Not easy to understand.
用法パターン：
[something] is complicated (to understand/explain)
よくある間違い：
Learners may use *complex* and *complicated* as identical; *complicated* often implies difficulty for people to understand or deal with.
類義語
complex (More neutral; can sound less negative.)
|
confusing (Emphasizes that it’s hard to follow.)
対義語
simple (Easy to understand or explain.)
|
clear (Easy to follow and understand.)
コロケーション
a complicated idea
|a complicated concept
|a complicated explanation
|a complicated theory
|complicated instructions
|a complicated question
|a complicated problem
|a complicated formula
|a complicated subject
|a complicated diagram
テーマ
communication
|education
|daily_life
例文
- The instructions are complicated, so read them twice before you start.
- She gave a complicated explanation that left everyone more confused.
- It’s a complicated topic, but the basic idea is straightforward.
学習者向け例文
- This is complicated.
- The question is complicated.
adjective
B1
property
2
having many parts or steps
With many parts or many steps.
用法パターン：
a complicated [system/process/machine]
よくある間違い：
Don’t confuse with *difficult* only; something can be complicated because it has many parts, even if each part is easy.
類義語
intricate (Suggests fine detail and careful design.)
|
elaborate (Often implies many details; can be positive.)
対義語
straightforward (Simple and easy to do or understand.)
|
basic (Without many details or parts.)
コロケーション
a complicated system
|a complicated process
|a complicated machine
|a complicated procedure
|a complicated design
|a complicated setup
|a complicated schedule
|a complicated plan
|a complicated structure
|a complicated network
テーマ
technology
|work
|daily_life
例文
- It’s a complicated process with several approval steps.
- The old heating system is complicated and expensive to repair.
- They replaced the complicated schedule with a simpler rotation.
学習者向け例文
- The process is complicated.
- This machine looks complicated.
adjective
B2
property
3
hard to deal with
Hard to deal with because many things affect it.
用法パターン：
a complicated [situation/case/matter]
よくある間違い：
Learners may say *a complicated* when they mean *a difficult*; *complicated* implies multiple factors or details, not just effort.
類義語
messy (Informal; emphasizes disorder and lack of clarity.)
|
tricky (Informal; emphasizes that it needs careful handling.)
対義語
easy (Not difficult to handle.)
|
simple (Involves few factors or problems.)
コロケーション
a complicated situation
|a complicated case
|a complicated matter
|a complicated issue
|a complicated decision
|a complicated negotiation
|a complicated dispute
|a complicated history
|a complicated arrangement
|a complicated set of circumstances
テーマ
daily_life
|work
|problem_solving
例文
- It’s a complicated situation, and there isn’t a quick fix.
- The case is complicated by missing records and conflicting statements.
- Moving abroad can be complicated when visas and taxes are involved.
学習者向け例文
- The situation is complicated.
- It’s complicated to solve.
adjective
B2
property
4
emotionally difficult relationship
Not simple because of feelings or past problems.
用法パターン：
a complicated relationship with [someone]
よくある間違い：
In this sense, *complicated* does not mean “hard to understand”; it means the relationship has problems or mixed feelings.
類義語
difficult (More general; not necessarily about mixed feelings.)
|
strained (Emphasizes tension between people.)
対義語
healthy (Emotionally supportive and functioning well.)
|
easy (Comfortable and without many problems.)
コロケーション
a complicated relationship
|a complicated friendship
|a complicated marriage
|a complicated breakup
|complicated feelings
|a complicated past
|a complicated family dynamic
|a complicated relationship with his father
|a complicated history with her ex
|a complicated love life
テーマ
relationships
|emotions
|social
例文
- He has a complicated relationship with his parents.
- I have complicated feelings about going back to my old job.
- Their friendship became complicated after they started working together.
学習者向け例文
- I have complicated feelings.
- They have a complicated relationship.
adjective
technical
C1
property
5
with medical complications
In medicine, having extra problems that make it harder to treat.
用法パターン：
a complicated [pregnancy/infection/fracture]
よくある間違い：
This is a medical meaning; in everyday talk, people more often say “serious” or “not straightforward.”
類義語
complex (Common in clinical contexts; emphasizes multiple factors.)
|
serious (Not the same; focuses on severity rather than added conditions.)
対義語
uncomplicated (Without additional problems or conditions.)
コロケーション
a complicated pregnancy
|a complicated infection
|a complicated fracture
|a complicated recovery
|a complicated surgery
|a complicated case
|a complicated delivery
|a complicated diagnosis
|a complicated illness
|a complicated wound
テーマ
health
|medicine
例文
- The doctor said it was a complicated fracture that would take time to heal.
- Most cases are uncomplicated, but a few become complicated by infection.
- She had a complicated recovery and needed extra monitoring.
学習者向け例文
- It was a complicated case.
- The recovery was complicated.
adjective
B2
property
6
not simple in structure
Not simple in its structure.
用法パターン：
a complicated [sentence/argument/piece]
よくある間違い：
For writing, *complicated* can sound negative (hard to follow). If you mean “sophisticated,” choose that word.
類義語
complex (Often preferred in academic contexts.)
|
sophisticated (More positive; suggests skill and refinement.)
対義語
simple (Has few elements and is easy to follow.)
|
plain (Without extra detail or complexity.)
コロケーション
a complicated sentence
|a complicated grammar point
|a complicated argument
|a complicated plot
|a complicated storyline
|a complicated piece of music
|a complicated proof
|a complicated equation
|a complicated analysis
|a complicated structure
テーマ
education
|language
|arts
例文
- Try not to use overly complicated sentences in this essay.
- The novel has a complicated plot with many characters.
- It’s a complicated argument, but the conclusion is clear.
学習者向け例文
- The plot is complicated.
- This sentence is complicated.
文法
辞書形
complicated
IPA
GB/kˈɑmplɪkˌeɪtɪd/
US/kˈɑmplɪkˌeɪtɪd/
音節・強勢
com - plic - ated （3音節）
Stress on 1st syllable (com)
活用形
Adjective
- Base: complicated
関連語
Core family
complicate
verb B1
complication
noun B1
Related words
complex
adjective B1
complexity
noun B2
Negative and opposite forms
uncomplicated
adjective
Advanced or less common
overcomplicate
verb
overcomplicated
adjective
表現
[something] is complicated by [something]
1/sˈʌmθɪŋ ˈɪz kˈɑmplɪkˌeɪtɪd bˈaɪ sˈʌmθɪŋ/
fixed phrase
made harder by another factor
Another thing makes it harder.
例文
- The rescue was complicated by bad weather.
- The investigation was complicated by a lack of witnesses.
- The project is complicated by new regulations.
it's complicated.
1/ˈɪts kˈɑmplɪkˌeɪtɪd ‖/
fixed phrase
informal
hard to explain simply
I can’t explain it easily; it’s not simple.
例文
- Are you two dating? It’s complicated.
- Why did you quit? It’s complicated—I’ll tell you later.
- Do you like him? It’s complicated.
to make matters more complicated
1/tə mˈeɪk mˈætɚz mˈɔɹ kˈɑmplɪkˌeɪtɪd/
fixed phrase
add another difficulty
And then there was another problem.
例文
- To make matters more complicated, the bank was closed that day.
- To make matters more complicated, we didn’t have her current address.
- The train was delayed, and to make matters more complicated, my phone battery died.
to make things complicated
1/tə mˈeɪk θˈɪŋz kˈɑmplɪkˌeɪtɪd/
fixed phrase
make it unnecessarily difficult
To make it harder than necessary.
例文
- Stop making things complicated—just choose one option.
- He made things complicated by changing the plan at the last minute.
- We don’t need to make things complicated; the solution is simple.