A1 noun #2,711 よく出る 3分で読める

prone

Prone describes someone who is likely to do something bad or a person lying flat on their stomach.

Explanation at your level:

Prone means you do something a lot. If you are prone to falling, you fall often. It also means lying on your tummy on the floor. It is a simple word for describing habits or how you lie down.

You use 'prone' when someone has a bad habit. For example, 'He is prone to being late.' It also describes a body position. If you lie on your stomach, you are in a prone position.

In English, we use 'prone to' to talk about things that happen regularly, usually negative things. 'My computer is prone to crashing.' It is also a technical term for lying face-down, often used in sports or medical contexts.

The word 'prone' is quite versatile. It denotes a natural susceptibility to a condition or behavior, such as being 'prone to migraines.' In more formal or technical registers, it refers specifically to the physical orientation of the body, meaning face-down as opposed to 'supine' (face-up).

Beyond the literal physical state, 'prone' serves as a sophisticated way to describe an inherent disposition toward a particular outcome. It implies a degree of inevitability or high probability. In academic or literary writing, it adds precision when describing psychological or physiological tendencies that are difficult to avoid.

Etymologically rooted in the Latin 'pronus,' the term carries a nuance of 'inclination' that has been refined over centuries. In mastery-level English, 'prone' is used to diagnose systemic weaknesses or predictable patterns in complex systems—whether human, mechanical, or societal. It distinguishes between accidental occurrences and those that are statistically or dispositionally 'prone' to happen, reflecting a deep command of causality and nuance.

30秒でわかる単語

  • Prone means likely to happen or experience.
  • It also means lying face-down.
  • Always use 'prone to' for tendencies.
  • Its opposite is 'supine'.

Hey there! Let's talk about the word prone. It is a really interesting word because it has two very different meanings depending on how you use it.

First, think about tendency. If you say someone is accident-prone, you mean they seem to have a habit of bumping into things or tripping over their own feet. It is like a magnet for little mishaps!

Second, think about position. If you are lying prone, you are stretched out flat on your stomach. You might see this in yoga or military training. It is all about how your body is touching the ground.

The word prone comes from the Latin word pronus, which literally means 'leaning forward' or 'bent downward.' It has been hanging around in the English language since the 15th century.

Originally, it was used mostly to describe physical posture. Over time, people started using it metaphorically. If you are physically leaning forward, it is easy to imagine you are 'leaning' toward a certain behavior or outcome. That is how we got the meaning 'likely to do something.'

It is a great example of how language evolves from physical actions to abstract ideas. It is related to the word prostrate, though they have slightly different vibes in modern English.

When using prone, you need to watch your context. If you are talking about health or habits, you almost always follow it with 'to.' For example, 'I am prone to headaches' or 'He is prone to exaggeration.'

In a formal or medical setting, you might hear it used to describe a patient's position. 'The patient was placed in a prone position for the surgery.' This is very standard in clinical environments.

Be careful not to mix it up with supine, which means lying on your back! That is a common mistake that even native speakers make sometimes.

While prone isn't the star of many idioms, it is often part of common compound phrases.

  • Accident-prone: Someone who has many accidents. 'She is so accident-prone that she broke three plates today!'
  • Injury-prone: An athlete who gets hurt often. 'The star player is unfortunately injury-prone.'
  • Prone to error: When something is likely to be wrong. 'This old calculator is prone to error.'
  • Prone to fits: Used for someone who loses their temper easily. 'He is prone to fits of rage.'
  • Prone to exaggeration: Someone who stretches the truth. 'Don't believe everything he says; he is prone to exaggeration.'

Grammatically, prone is an adjective. You don't pluralize it or add articles like 'a' or 'the' directly to it. You usually use it with a linking verb like 'is,' 'are,' or 'was.'

The pronunciation is straightforward: /proʊn/. It rhymes with bone, stone, phone, loan, and grown. The stress is on the single syllable, making it punchy and clear.

Remember the pattern: Be + prone + to + verb/noun. It is a very consistent structure that makes it easy to use once you get the rhythm down!

Fun Fact

It shares a root with the word 'prone' in the sense of 'inclined' because leaning forward is a physical inclination.

Pronunciation Guide

UK /prəʊn/

Sounds like 'proan' with a long o.

US /proʊn/

Sounds like 'proan' with a long o.

Common Errors

  • Pronouncing it like 'prone' with a short o
  • Adding an extra syllable
  • Confusing with 'prune'

Rhymes With

bone stone phone loan grown

Difficulty Rating

読解 2/5

easy

Writing 2/5

easy

Speaking 2/5

easy

リスニング 2/5

easy

What to Learn Next

Prerequisites

likely tendency position

Learn Next

susceptible inclined supine

上級

predisposed vulnerable

Grammar to Know

Adjective + Preposition

prone to

Linking Verbs

He is prone

Participle Adjectives

prone

Examples by Level

1

The cat is prone on the rug.

The cat is lying flat.

Adjective usage.

2

I am prone to colds.

I get colds often.

Prone to + noun.

3

He is prone to trips.

He trips often.

Prone to + noun.

4

The dog lies prone.

The dog lies on its belly.

Adjective.

5

She is prone to fear.

She gets scared easily.

Prone to + noun.

6

The map is prone to tears.

It rips easily.

Prone to + noun.

7

He lies prone now.

He is on his stomach.

Adjective.

8

I am prone to naps.

I like napping.

Prone to + noun.

1

He is prone to losing his keys.

2

The area is prone to flooding.

3

She lies prone to stretch her back.

4

My car is prone to stalling.

5

He is prone to headaches.

6

The athlete lies prone after the race.

7

They are prone to arguments.

8

The plant is prone to wilting.

1

The region is prone to earthquakes during the spring.

2

I am prone to forgetting names at parties.

3

The soldier lay prone to avoid being seen.

4

This model of phone is prone to battery issues.

5

He is prone to bouts of melancholy.

6

She lies prone on the mat for yoga.

7

The system is prone to technical failures.

8

We are prone to mistakes when we are tired.

1

The patient was kept in a prone position to assist breathing.

2

Critics are prone to harsh judgments of new films.

3

The coastal village is prone to severe storm damage.

4

He is prone to sudden changes of heart.

5

The project is prone to delays due to funding.

6

She lay prone, watching the ants in the grass.

7

Teenagers are often prone to mood swings.

8

The software is prone to security vulnerabilities.

1

The company is prone to overestimating its quarterly growth.

2

His writing style is prone to unnecessary verbosity.

3

In the prone position, the diver prepared for the jump.

4

Societies are often prone to repeating past mistakes.

5

The engine is prone to overheating under heavy loads.

6

She is prone to bouts of intense creative inspiration.

7

The theory is prone to criticism from modern scholars.

8

He is prone to grandiosity when he talks about his past.

1

The structural integrity of the bridge is prone to degradation over time.

2

He maintained a prone posture to minimize his silhouette.

3

The population is prone to cyclical patterns of migration.

4

Such arguments are prone to logical fallacies.

5

The ecosystem is prone to collapse if the temperature rises.

6

She is prone to fits of existential reflection.

7

The architecture is prone to aesthetic obsolescence.

8

The data is prone to skewing due to sampling bias.

類義語

susceptible liable inclined vulnerable disposed

反対語

よく使う組み合わせ

accident-prone
prone to error
prone position
prone to injury
prone to flooding
prone to change
prone to exaggeration
prone to infection
prone to mood swings
prone to criticism

Idioms & Expressions

"accident-prone"

likely to have accidents

I am so accident-prone!

casual

"prone to fits"

having sudden outbursts

He is prone to fits of anger.

neutral

"prone to exaggeration"

making things sound bigger

Don't trust his stories; he's prone to exaggeration.

neutral

"prone to error"

likely to make mistakes

This draft is prone to error.

formal

"prone to failure"

likely to stop working

The old system is prone to failure.

neutral

Easily Confused

prone vs supine

both refer to lying down

prone is face-down, supine is face-up

He lay prone; she lay supine.

prone vs prostrate

both mean lying down

prostrate implies submission or exhaustion

He lay prostrate in prayer.

prone vs prone to

sounds like 'prone of'

always use 'to'

Prone to errors.

prone vs prune

similar sound

prune is a fruit or verb for cutting

I ate a prune.

Sentence Patterns

A1

Subject + is + prone + to + noun

He is prone to anger.

A2

Subject + is + prone + to + verb

It is prone to break.

B1

Noun + is + in + a + prone + position

The patient is in a prone position.

B2

Subject + lies + prone

He lies prone on the grass.

C1

Subject + is + highly + prone + to + noun

The area is highly prone to floods.

語族

Nouns

proneness the state of being likely to do something

Adjectives

prone likely or lying face down

関連

supine opposite physical position

How to Use It

frequency

7

Formality Scale

Clinical (most formal) Academic Neutral Casual

よくある間違い

Using 'prone' for 'supine' supine
Prone is face down, supine is face up.
Forgetting 'to' prone to
Prone requires the preposition 'to'.
Using 'prone' as a verb is prone
Prone is an adjective, not a verb.
Confusing with 'prone' as a noun adjective
It is not a noun.
Overusing in casual speech tends to
Prone can sound a bit clinical.

Tips

💡

Memory Palace

Visualize a 'prone' person on a 'pro' (professional) floor.

💡

Native Speaker Tip

Always pair it with 'to' when talking about habits.

🌍

Sports Context

Athletes are often described as 'injury-prone'.

💡

Grammar Shortcut

Think of it as 'inclined to'.

💡

Say It Right

Rhymes with stone.

💡

Don't Mix Up

Don't say 'prone of'.

💡

Did You Know?

It comes from Latin for 'leaning'.

💡

Study Smart

Use it in sentences about your own habits.

💡

Academic Writing

Use it to describe data trends.

💡

Casual Speaking

Use it to describe clumsy friends.

Memorize It

Mnemonic

Prone: P-R-O-N-E (P)eople (R)esting (O)n (N)oses (E)verywhere.

Visual Association

Imagine a person lying on their stomach on the floor.

Word Web

Tendency Position Susceptibility Physical

チャレンジ

Write three sentences about things you are prone to doing.

語源

Latin

Original meaning: leaning forward

文化的な背景

None, but be careful when describing someone's physical state.

Used frequently in medical and sports journalism.

Used in many medical dramas like Grey's Anatomy.

Practice in Real Life

Real-World Contexts

Medical

  • prone position
  • prone to infection
  • prone to swelling

Sports

  • injury-prone
  • prone to fatigue
  • prone to errors

Daily Life

  • accident-prone
  • prone to forgetting
  • prone to mood swings

Academic

  • prone to bias
  • prone to failure
  • prone to variation

Conversation Starters

"Are you accident-prone?"

"What kind of weather is your area prone to?"

"Do you find it hard to lie in a prone position?"

"What mistakes are you prone to making?"

"Do you think some people are prone to being happy?"

Journal Prompts

Describe a time you were accident-prone.

What are you prone to worrying about?

How does your body feel when you lie prone?

Is it better to be prone to optimism or pessimism?

よくある質問

8 問

No, it is a neutral descriptive word.

Yes, like 'prone to breaking'.

Supine.

No, it also means a tendency.

No, it is an adjective.

Like 'proan'.

No, always 'prone to'.

Yes, in both daily and formal English.

自分をテスト

fill blank A1

I am ___ to colds in winter.

正解! おしい! 正解: prone

Prone to is the correct phrase.

multiple choice A2

What does 'prone' mean?

正解! おしい! 正解: Lying face-down

Prone means lying face-down.

true false B1

Prone is the same as supine.

正解! おしい! 正解: 間違い

They are opposites.

match pairs B1

Word

意味

All matched!

Physical positions.

sentence order B2

下の単語をタップして文を組み立てよう
正解! おしい! 正解:

He is prone to colds.

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