Compound adjectives are adjectives made up of two or more words joined by a hyphen. Examples include English-speaking, time-saving, and thirty-floor. Compound adjectives are formed by joining words with a hyphen before a noun to act as a single adjective describing it. There are different types of compound adjectives such as those using numbers and time periods, adverbs and past/present participles combined with nouns, and adjectives combined with nouns. Knowing when to use a hyphen depends on whether the words can be joined by "and"; if so, a hyphen is unnecessary.

1. Compound Adjectives
What are compound adjectives?
Compound adjectives are adjectives that are made up of two or more words usually with
hyphens (-) between them.
Examples:
An English-speaking country.
A time-saving gadget.
A thirty-floor building.
How are compound adjectives formed?
Compound adjectives
A compound adjective is an adjective that contains two or more words.
In general we put a hyphen between two or more words (before a noun) when we want
them to act as a single idea (adjective) that describes something.
I live in an English-speaking country.
English-speaking is an adjective (used to describe the country). We use a hyphen to connect
the word English with speaking to show that it is one adjective (or one idea).
This adjective with two words joined by the hyphen is called a compound adjective.
Some more examples of compound adjectives are:
Our office is in a twenty-storey building.
I have just finished reading a 300-page book.
He is a well-known writer.
There are many types of Compound Adjectives. Here is a list of the most common types:
Compound Adjectives + Periods of Time
When he have compound adjectives using numbers + a time period, that word referring to a
time period is in singular form and is joined to the number with a hyphen.

2. I work eight hours every day --> I work an eight-hour day
I'm going on vacation for three weeks --> I have a three-week vacation
There was a delay of 5 seconds --> There was a five-second delay
Notice how we normally write the number as a word, not in numerical form.
Adverbs and Compound Adjectives
Adverbs modify a verb.
She walks slowly.
How does she walk? Slowly. Slowly is an adverb that modifies (or describes) the verb.
Adverbs can also be used to modify an adjective.
It is very hot today. (Very is an adverb)
She is extremely intelligent. (Extremely is an adverb)
Notice how we do not put a hyphen between an adverb and an adjective (not even before a
noun).
It is a very hot day.
She is an extremely intelligent girl.
Adverb + Past Participle
However when we have an Adverb + past participle, we put a hyphen between the two
words to make it a compound adjective.
This is a brightly-lit room.

3. She is a well-known actress.
We live in a densely-populated city.
Noun + Past Participle
When we have a noun + past participle, we put a hyphen between the two words to make it
a compound adjective.
We should start using wind-powered generators to cut costs.
I love eating sun-dried raisins.
Noun + Present Participle
When we have a noun + present participle, we put a hyphen between the two words to
make it a compound adjective.
I bought some mouth-watering strawberries.
That was a record-breaking jump.
Noun + Adjective
When we have a noun + adjective, we put a hyphen between the two words to make it a
compound adjective.
She is a world-famous singer.
This is a smoke-free restaurant.
Adjective + Noun
When we have an adjective + noun, we put a hyphen between the two words to make it a
compound adjective.
It was a last-minute decision.
We watched the full-length version of the movie.
Adjective + Past Participle

4. When we have an adjective + past participle, we put a hyphen between the two words to
make it a compound adjective.
That is an old-fashioned dress
Reptiles are cold-blooded creatures.
Adjective + Present Participle
When we have an adjective + present participle, we put a hyphen between the two words to
make it a compound adjective.
She is a good-looking girl.
It left a long-lasting taste in my mouth.
Compound Adjectives with Proper Nouns
A proper noun is the name of something or someone (e.g. John, Susan Sanders).
Compound Adjectives made from Proper nouns don't need a hyphen though must have
capital letters.
I bought the James Jackson tickets for us.
James Jackson is a compound adjective describing the tickets (What type of tickets? James
Jackson tickets). Since the adjective is a Proper noun, we don't need a hyphen between the
two names.
How do we know when to put a hyphen?
If you can use the word “and” between the two adjectives or words, then a hyphen isn't
necessary.
She has a big blue book.

5. (Big and Blue are adjectives)
Can we say: She has a big and blue book. (Yes, it is possible)
He is a world famous singer
Can we say: He is a world and famous singer. No, it doesn't sound correct so we need a
hyphen to join the words world and famous.
Also, look at the following:
It's an old coal-mining town
Notice how we didn't put a hyphen between the word old and coal. If we had have done
that, we would have been referring to old coal, as in coal that is old. We want to emphasis
that the town in old and not the coal.
Exercises:
Characteristics

 a good-looking girl - una muchacha linda
 a well-dressed woman - una mujer bien vestida
 a pair of high-heeled shoes - un par de zapatos de tacos altos
 a well-known actor - un actor bien conocido
 some handmade toys - algunos juguetes hechos a mano
 a bulletproof vest - un chaleco a prueba de balas
 a first-class ticket - un boleto de primera clase
 a well-kept house - una casa bien conservada
 a part-time job - un trabajo de medio día
 a brand-new radio - una radio completamente nueva
 several duty-free goods - varios productos libres de impuestos
 a one-way street - una calle de una sola vía
 a second-hand car - un coche de segunda mano
Personality

 a hard-working person - una persona trabajadora
 a tight-fisted banker - un banquero tacaño

6.  a kind-hearted mother - una madre bondadosa
 an absent-minded scientist - un científico distraído
 a two-faced politician - un político falso
 a pigheaded friend - un amigo testarudo
 a smooth-tongued employee - un empleado chupamedias
 a stuck-up model - una modelo engreída
 a self-centered artist - un artista egocéntrico
 a good-natured professor - un profesor bonachón
 a quick-tempered boss - un jefe irascible
 a broad-minded president - un presidente tolerante, de mente abierta
 a narrow-minded minister - un ministro de mente estrecha
Body

 a fair-haired girl - una chica de pelo rubio
 a curly-haired baby - un bebé de pelo rizado
 a green-eyed woman - una mujer de ojos verdes
 a long-legged model - una modelo de piernas largas
 a left-handed boxer - un boxeador zurdo
 a right-handed tennis player - un tenista diestro
 a flatfooted runner - un corredor de pie plano
 a bowlegged cowboy - un vaquero patizambo, chueco
 a short-sighted writer - un escritor corto de vista
 a cross-eyed boy - un chico bizco
 a dark-skinned person - una persona de piel oscura
 a narrow-waisted actress - una actriz de cintura angosta
 a freckle-faced little girl - una niñita de cara con pecas
Quantity

 a five-dollar bill - un billete de cinco dólares
 a six-sided figure - un figura de seis lados
 a twenty-year-old girl - una chica de veinte años
 a three-hour conference - una conferencia de tres horas
 a ten-page report - un informe de diez páginas
 a four-day journey - un viaje de cuatro días
 a five-kilometer tunnel - un túnel de cinco kilómetros
 a thirty-question test - una prueba de treinta preguntas
 a two-week tour - un tour de dos semanas
 a ten-minute call - una llamada de diez minutos
 a twenty-mile border - una frontera de veinte millas
 a ten-speed bicycle - una bicicleta de diez velocidades
 a forty-story building - edificio de cuarenta pisos

7. Here we can say it is old and a coal-mining one.
 http://www.myenglishpages.com/site_php_files/vocabulary-exercise-compound-
adjectives(2).php.
 http://www.grammar.cl/english/compound-adjectives.htm.