unsafe
gb/ʌnsˈeɪf/ us/ʌnsˈeɪf/
B1
英語
~ 8300
語義
0件の語義
adjective
B1
property
1
likely to cause harm or injury
not safe and may cause harm or injury
用法パターン：
[something] is unsafe to use
よくある間違い：
Learners sometimes say *"not safe"* instead of using the single word *"unsafe"*. Both are correct, but *"unsafe"* is more natural in many collocations, such as *"unsafe working conditions"* or *"unsafe to drink"*. Another confusion is using *"insecure"* for physical danger; *"insecure"* usually describes emotional feelings or weak protection, while *"unsafe"* focuses on risk of harm.
類義語
dangerous (Very common and general; often a bit stronger or more emotional than "unsafe".)
|
hazardous (Often used in official or technical contexts, especially about chemicals or jobs.)
|
risky (Focuses more on the chance of something bad happening, not only physical harm.)
対義語
safe (The direct opposite; suggests no real danger of harm.)
|
secure (Stresses protection from danger or attack, especially for places and people.)
コロケーション
unsafe working conditions
|unsafe drinking water
|unsafe building
|unsafe environment
|declare [something] unsafe
|unsafe to use
テーマ
safety
|health
|daily life
|daily_life
|core_vocabulary
例文
- The old bridge was declared unsafe and closed to traffic.
- Children were playing on an unsafe balcony with broken railings.
- Workers went on strike to protest what they called unsafe working conditions.
- Scientists warned that the river water was unsafe to drink after the chemical spill.
- She felt unsafe walking alone through the poorly lit parking lot.
学習者向け例文
- This ladder is unsafe to climb.
- The doctor said the air in the factory is unsafe.
- It is unsafe to drive so fast in the rain.
- The building looks unsafe after the earthquake.
- Many people feel unsafe on that dark street at night.
adjective
B2
property
2
not secure; open to attack
not well protected, so someone can attack, steal, or use it in a bad way
用法パターン：
[system/website/password] is unsafe
よくある間違い：
Learners sometimes use *"dangerous"* instead of *"unsafe"* for digital or data security, as in *"a dangerous website"*. While this is understandable, native speakers more often say *"unsafe website"* or *"unsecure / insecure website"* in this context.
類義語
insecure (Common in technical and security contexts; focuses on weak protection.)
|
vulnerable (Highlights that something can be easily attacked or harmed, especially systems or data.)
|
unprotected (Plain word showing that there is little or no protection in place.)
対義語
secure (Standard opposite in IT and security; suggests strong protection against attacks.)
|
protected (Emphasizes that guards, locks, or technical measures keep something safe.)
コロケーション
unsafe website
|unsafe network
|unsafe password
|unsafe system
|marked as unsafe
|considered unsafe
テーマ
technology
|security
|business
|law
例文
- Your browser is warning that this website is unsafe.
- The company was fined for storing customer data in an unsafe online system.
- Using the same simple word as every password is extremely unsafe.
- Experts say the network is unsafe and could be hacked at any time.
- He clicked on a link from an unsafe email and infected his computer with malware.
学習者向け例文
- This Wi‑Fi network is unsafe to use.
- The bank said my old password was unsafe.
- Do not enter your credit card number on an unsafe website.
- The app may be unsafe if you download it from unknown pages.
- They moved their files from an unsafe server to a secure one.
adjective
B2
action
3
sexual activity without protection
describes sex without a condom or other protection that lowers the chance of pregnancy or disease
用法パターン：
unsafe sex
よくある間違い：
Learners sometimes think *"unsafe sex"* just means sex that feels emotionally wrong or uncomfortable. In health and education contexts, it has a specific meaning: sex without protection that increases the risk of pregnancy or sexually transmitted infections.
類義語
unprotected (Often used as *"unprotected sex"*, the most direct synonym in this health context.)
対義語
protected (As in *"protected sex"*, shows that contraception or barriers are used.)
|
safe (As in *"safe sex"*, a very common health-education term.)
コロケーション
unsafe sex
|practice unsafe sex
|have unsafe sex
|risk of unsafe sex
|avoid unsafe sex
テーマ
health
|relationships
|education
例文
- The campaign aims to reduce the number of young people having unsafe sex.
- He regretted having unsafe sex after learning about the risk of infections.
- Doctors warned that unsafe sex can lead to serious health problems.
- Schools now give clear information about the dangers of unsafe sex.
- She went to a clinic for tests because she had had unsafe sex.
学習者向け例文
- Unsafe sex can cause disease.
- They learned in class why unsafe sex is dangerous.
- The nurse told them not to have unsafe sex.
- Condoms help people avoid unsafe sex.
- He was worried because he had unsafe sex last month.