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(ordered by seriousness) ESL Vocabulary Lists Parts of Speech Lists A-Z Idioms and Proverbs Grammar Videos
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Hyphens in Compound Adjectives
When should I put a hyphen in an adjective?
Hyphens are used to link the words in compound adjectives to show they are single adjectives. For example:- two-seater aircraft
- never-to-be-forgotten experience

- I have sent you a three-page summary. (The words in the compound adjective "three-page" are linked with a hyphen to show they are part of the same adjective.)
- I have torn the ironing-board cover. (The words in the compound adjective "ironing-board" are linked with a hyphen to show they are part of the same adjective.)
Compound Adjectives with Numbers
The easiest compound adjectives to spot are the ones that include numbers. For example:- Two-seater aircraft
- 4-bedroom house
- 45-minute journey
- 15-page document
- 5-and-a-half-year-old child
- Three stone weakling

Compound Adjectives Without Numbers
Lots of compound adjectives do not include numbers. For example:- Philip is a far-too-chatty individual.
- That was a never-to-be-forgotten experience.
- James is a second rate plumber.
- The double glazing is still leaking. Can you call that double-glazing salesman?
- You call this silver service? She's not a trained silver-service waitress.
How To Spot a Compound Adjective
Put "and" between the adjectives. If there is no loss of meaning, then you are likely dealing with several adjectives as opposed to a compound adjective. Let's try a few:- I have a large proud rooster. (Is this a compound adjective? Do I need a hyphen?)
Step 1 | Look at your adjectives: | large proud rooster |
Step 2 | Put "and" between them: | large and proud rooster |
Step 3 | Check the new wording: | Although different in style, there is no loss of meaning. This is an example of two adjectives, not a compound adjective. Therefore, no hyphen is required. large proud rooster ![]() |
- I have a free range rooster. (Is this a compound adjective? Do I need a hyphen?)
Step 1 | Look at your adjectives: | free range rooster |
Step 2 | Put "and" between them: | free and range rooster |
Step 3 | Check the new wording: | In this example, there is a change in meaning. The rooster is not "free" and what is a "range rooster"? This is a compound adjective. free-range rooster ![]() |
- I worked at a first aid post. (Is this a compound adjective? Do I need a hyphen?)
Step 1 | Look at your adjectives: | first aid post |
Step 2 | Put "and" between them: | first and aid post |
Step 3 | Check the new wording: | Although "aid post" is okay, there is a change in meaning with "first post." This is a compound adjective. first-aid post ![]() |
The Hyphen Might Be Essential
Sometimes, a hyphen is essential to avoid ambiguity. Look at these examples:- a heavy-metal detector
- a heavy metal detector
Don't Confuse Adverbs with Adjectives with Compound Adjectives
Adjectives are often preceded by adverbs like "very," "well," "beautifully," and "extremely."Usually, there is no need to link an adverb to an adjective using a hyphen. For example:
- Young Paula is a very talented student.
- It is a wonderfully-decorated tree.
- wonderfully-decorated tree
- classically-trained pianist
- happily-married couple
- Alan is the best-known player on the pitch. (In this example, Alan is known better than any other player.)
- Alan is the best known player on the pitch. (This example could be taken to mean the same as the one above or it could be taken to mean that Alan is the best player of all the known players on the pitch. The hyphen eliminates ambiguity.)
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