Compound Adjectives: Well-Known, Hard-Working, Three-Year-Old
Grammar Rule in 30 Seconds
Use a hyphen to join two or more words into a single adjective before a noun to avoid confusion.
- Use a hyphen when the compound adjective comes BEFORE the noun: 'A well-known actor.'
- Do NOT use a hyphen when the compound adjective comes AFTER the noun: 'The actor is well known.'
- Never use a hyphen with an adverb ending in -ly: 'A highly intelligent student.'
Compound adjectives join two or more words into a single modifier. The key rule: hyphen before the noun, no hyphen after a verb.
The Hyphen Rule
Before noun → hyphen
✅ a well-known actor
✅ a three-year-old child
✅ a thought-provoking film
After verb → no hyphen
✅ The actor is well known.
✅ The child is three years old.
✅ The film was thought provoking.
Common Types
Number + noun
a ten-minute break • a two-bedroom flat • a five-star hotel
Well/badly + past participle
well-known • well-dressed • badly-written • badly-paid
Noun + past participle
hand-made • home-grown • air-conditioned • water-resistant
Participial (verb-based)
good-looking • fast-moving • long-lasting • hard-working
Meanings
Compound adjectives are two or more words that act as a single idea to describe a noun. They are typically hyphenated when placed before the noun to show they function as one unit.
Pre-nominal modification
Describing a noun using a multi-word phrase.
“A long-term solution.”
“A part-time job.”
Post-nominal usage
Describing a noun after a linking verb.
“The solution is long term.”
“The job is part time.”
Compound Adjective Formation
| Structure | Example | Before Noun | After Noun |
|---|---|---|---|
| Adj + Noun + ed | Blue eyes | Blue-eyed boy | The boy is blue eyed |
| Noun + Participle | Sun dried | Sun-dried tomatoes | The tomatoes are sun dried |
| Adj + Participle | Hard working | Hard-working staff | The staff is hard working |
| Number + Noun | Five years | Five-year-old child | The child is five years old |
| Noun + Adj | World famous | World-famous singer | The singer is world famous |
| Adverb + Participle | Well known | Well-known fact | The fact is well known |
Reference Table
| Form | Structure | Example |
|---|---|---|
| Attributive | Compound + Noun | A well-known actor |
| Predicative | Noun + Verb + Compound | The actor is well known |
| Negative | Not + Compound + Noun | A not-so-good idea |
| Question | Is it a + Compound + Noun? | Is it a part-time job? |
| Short Answer | Yes, it is + Compound | Yes, it is part time |
| -ly Exception | Adverb + Participle | A highly trained team |
| Number Variation | Number + Noun | A ten-mile hike |
Formality Spectrum
The position is part-time. (Job search)
It is a part-time job. (Job search)
It's a part-time gig. (Job search)
It's a side hustle. (Job search)
Compound Adjective Logic
Before Noun
- Hyphen Yes
After Noun
- Hyphen No
-ly Adverbs
- Hyphen Never
Hyphen vs No Hyphen
Decision Flowchart
Is it before the noun?
Does it end in -ly?
Common Types
Time
- • Five-year-old
- • Long-term
Quality
- • Well-known
- • Hard-working
Tech
- • User-friendly
- • State-of-the-art
Examples by Level
I have a red car.
He is a tall man.
It is a big house.
She is a nice girl.
I have a part-time job.
He is a well-known actor.
It is a five-star hotel.
She is a hard-working student.
This is a long-term project.
We need a user-friendly interface.
He is a self-made millionaire.
It was a life-changing experience.
The company offers a state-of-the-art facility.
She is a detail-oriented professional.
We require a cost-effective solution.
It is a world-renowned institution.
The policy is a short-sighted measure.
He gave a thought-provoking speech.
The book is a much-anticipated release.
They reached a mutually-beneficial agreement.
The architect designed a climate-resilient structure.
His performance was nothing short of awe-inspiring.
The data revealed a statistically-significant correlation.
It was a time-honored tradition.
Easily Confused
Learners think all two-word phrases need hyphens.
Learners hyphenate adverbs like 'very' or 'really'.
Learners keep the hyphen after the noun.
Common Mistakes
A well-known actor.
A well-known actor.
A ten years old boy.
A ten-year-old boy.
He is a well-known.
He is well known.
A hard working man.
A hard-working man.
The actor is well-known.
The actor is well known.
A highly-trained athlete.
A highly trained athlete.
A part time job.
A part-time job.
A long-term-plan.
A long-term plan.
A very-good idea.
A very good idea.
The project is long-term.
The project is long term.
A much-anticipated-release.
A much-anticipated release.
A statistically-significant-result.
A statistically significant result.
The result is statistically-significant.
The result is statistically significant.
A well-known-actor.
A well-known actor.
Sentence Patterns
It is a ___ ___ job.
He is a ___ ___ person.
The ___ is ___ ___.
I need a ___ ___ solution.
Real World Usage
We are looking for a hard-working candidate.
This is a user-friendly interface.
We stayed at a five-star hotel.
This is a must-see movie!
We need a long-term solution.
The meal was sun-dried tomato pasta.
Check the position
No -ly hyphens
Use it for clarity
Professionalism
Smart Tips
Add a hyphen to link the words.
Remove the hyphen.
Don't hyphenate.
Hyphenate the number and noun.
Pronunciation
Stress
Usually, the stress falls on the first part of the compound adjective.
Compound Stress
A 'WELL-known 'ACTOR
Shows the compound is a single unit.
Memorize It
Mnemonic
Hyphens are like bridges; they only connect words when they are crossing over to reach the noun.
Visual Association
Imagine a tiny bridge (the hyphen) between two words. If the noun is waiting on the other side, the bridge is built. If the noun is already behind them, the bridge disappears.
Rhyme
Before the noun, the hyphen stays; after the noun, it goes away.
Story
A man-eating shark was swimming. The shark was man eating. Wait, that's wrong! A man-eating shark (hyphenated) is scary. A shark that is man eating (no hyphen) just sounds like he's having dinner.
Word Web
Challenge
Write 5 sentences about your dream job using at least 3 compound adjectives.
Cultural Notes
Hyphenation is very common in professional and business contexts to show efficiency.
Similar to American, but sometimes more conservative with hyphenation.
Used heavily in international business to ensure clarity across different native languages.
Hyphens were introduced to English to clarify meaning in complex phrases.
Conversation Starters
What is a part-time job you have had?
Do you prefer a long-term plan or short-term goals?
What makes a website user-friendly?
Who is a world-renowned person you admire?
Journal Prompts
Test Yourself
He is a ___ worker.
Find and fix the mistake:
The job is part-time.
Which is correct?
Arrange the words in the correct order:
All words placed
Click words above to build the sentence
Un trabajo de tiempo parcial.
Answer starts with: A p...
Match each item on the left with its pair on the right:
You should always hyphenate compound adjectives.
A: Is the movie good? B: Yes, it's ___.
Score: /8
Practice Exercises
8 exercisesHe is a ___ worker.
Find and fix the mistake:
The job is part-time.
Which is correct?
a / actor / well-known / is / he
Un trabajo de tiempo parcial.
Match the compound adjective.
You should always hyphenate compound adjectives.
A: Is the movie good? B: Yes, it's ___.
Score: /8
FAQ (8)
To show that two words are working together as one adjective.
No, only when the adjective is before the noun.
Never hyphenate them.
Only when it modifies a noun, like 'a five-year-old boy'.
Yes, hyphenate all of them if they modify a noun (e.g., 'state-of-the-art').
If it describes a noun, it's an adjective.
Yes, it is standard in formal English.
The rules are generally the same.
Scaffolded Practice
1
2
3
4
Mastery Progress
Needs Practice
Improving
Strong
Mastered
In Other Languages
Compound words (e.g., 'fünfjährig')
German uses one word; English uses hyphenated words.
Adjective phrases (e.g., 'à temps partiel')
French uses 'à' or 'de' instead of hyphens.
Adjective phrases (e.g., 'a tiempo parcial')
Spanish rarely uses hyphens for adjectives.
Compound nouns/adjectives (e.g., 'part-time' as 'arubaito')
Japanese doesn't use hyphens.
Idafa or adjective phrases
Arabic does not use hyphens.
Adjective + de + Noun
Chinese has no hyphenation system.
Learning Path
Prerequisites
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