An adjective phrase is a phrase built around an adjective. The adjective is the main word, and other words may come before or after it to add more detail.
an extremely confident speaker
students eager to begin
In extremely confident, the adjective confident is the main word. In eager to begin, the phrase is built around eager.
What matters is not simply that a phrase describes a noun. Its structure matters too.
What Is an Adjective Phrase?
An adjective phrase is a phrase headed by an adjective.
The adjective may appear by itself, or other words may come before or after it to add more detail.
happy
very happy
proud of her work
extremely difficult to replace
In each example, the adjective carries the main meaning:
- happy
- proud
- difficult
The words around the adjective either strengthen, limit, or complete its meaning.
In many modern grammar descriptions, a single adjective can also count as an adjective phrase because the adjective itself is the head. In school grammar, however, the word phrase is often reserved for a group of words.
Both uses are common, so you may see the term explained differently depending on the grammar source.
The Head Adjective
The head adjective is the central word in an adjective phrase.
Consider:
very nervous
The head is nervous. The word very modifies it.
Now look at:
proud of her team
The head is proud. The phrase of her team completes its meaning.
A longer phrase can have information on both sides:
extremely proud of her team
Here, proud is still the word around which the phrase is built.
Once you can spot the head adjective, the rest of the phrase is usually much easier to understand.
How Adjective Phrases Are Built
Adjective phrases can be very short or include several parts.
Modifier + Adjective
A modifier can come before the adjective and change its degree or emphasis.
very quiet
quite unusual
slightly nervous
extremely useful
In each case, the adjective remains the head.
Adjective + Complement
Some adjectives feel incomplete without extra information after them.
afraid of spiders
interested in architecture
ready to leave
certain that the figures were correct
For example:
She is proud of her progress.
The phrase of her progress tells us what she is proud of.
Modifier + Adjective + Complement
An adjective phrase can also have information on both sides of the adjective.
deeply concerned about the delay
very proud of her work
completely ready to begin
In:
very proud of her work
very modifies proud, while of her work completes its meaning.
Other Patterns Around the Adjective
Some adjective phrases take slightly different shapes.
old enough to drive
more useful than the previous version
too heavy to lift
so tired that she fell asleep
as useful as the original
In all of these examples, the adjective is still the center of the phrase, even though the surrounding words are doing different jobs.
Common Adjective Phrase Patterns
The most useful patterns can be summarized like this:
| Pattern | Example |
|---|---|
| adjective | ready |
| adverb + adjective | very ready |
| adjective + prepositional complement | proud of her work |
| adjective + infinitive | ready to leave |
| adjective + clause | certain that it will work |
| modifier + adjective + complement | extremely proud of the result |
| comparative adjective phrase | more useful than before |
| adjective + enough | strong enough |
| too + adjective + infinitive | too heavy to lift |
| so + adjective + clause | so tired that she fell asleep |
| as + adjective + as | as useful as the original |
These are the patterns you are most likely to see, not every possible form an adjective phrase can take.
Where Do Adjective Phrases Appear?
Adjective phrases can appear in several positions in a sentence.
Before a Noun
An adjective phrase can come before the noun it modifies.
an extremely narrow path
a surprisingly effective solution
a very difficult decision
This is an attributive use.
After a Linking Verb
Adjective phrases often appear after linking verbs such as be, seem, become, look, feel, and sound.
The path is extremely narrow.
The solution seems surprisingly effective.
She became more confident than before.
Here, the adjective phrase describes the subject. This is called a predicative use.
As an Object Complement
An adjective phrase can also describe the object of a verb.
The news made everyone deeply anxious.
We found the instructions surprisingly easy to follow.
The extra lighting kept the room bright enough to work in.
In each example, the adjective phrase tells us something about the object.
After a Noun or Pronoun
Some adjective phrases come after the noun or pronoun they describe.
someone willing to help
the person responsible for security
applicants familiar with the software
the rooms available this week
This kind of after-the-noun placement is especially common when the adjective has extra information after it. Grammatically, this is called postpositive position.
Compare:
a useful resource
and:
a resource useful for new teachers
The second arrangement is natural because useful is followed by for new teachers.
By contrast:
an extremely useful for new teachers resource
is not the usual word order.
How to Identify an Adjective Phrase
If a phrase is difficult to classify, these four clues usually make it clearer.
1. Find the Main Adjective
Look for the adjective carrying the main descriptive meaning.
very patient
proud of the result
ready to leave
2. Include the Words That Belong With It
Modifiers and complements can form part of the same phrase.
In:
very proud of her work
the complete adjective phrase is very proud of her work, not simply proud.
3. Keep the Noun Being Described Outside the Phrase
In:
a very old house
the adjective phrase is very old.
The noun house is not part of it.
4. Check What the Phrase Is Built Around
Compare:
a woman very proud of her work
a woman with considerable experience
Both expressions describe woman, but their structures are different.
The first is centered on the adjective proud. The second is built around the preposition with.
That difference determines the phrase type.
Adjective Phrase and Adjectival Function
Adjective phrase and adjectival sound similar, but they are not always used in exactly the same way.
An adjective phrase is identified by its structure. Its head is an adjective:
the students eager to begin
Here, eager to begin is an adjective phrase headed by eager.
The word adjectival can be used more broadly for something that performs an adjective-like function by adding information about a noun.
For example:
the house on the corner
On the corner modifies house, so its function is adjectival. Structurally, however, it is a prepositional phrase.
This helps explain why some grammar sources use the term adjective phrase more broadly than others.
Adjective Phrase vs Prepositional Phrase
An adjective phrase and a prepositional phrase can both add information about a noun, but their internal structures are different.
Compare:
a student proud of her progress
a student with excellent results
Proud of her progress is an adjective phrase headed by the adjective proud.
With excellent results is a prepositional phrase built around with.
Their functions may be similar, but they are not the same kind of phrase.
Adjective Phrase vs Adverb Phrase
The head word also separates adjective phrases from adverb phrases.
very quiet
The head is the adjective quiet, so this is an adjective phrase.
very quietly
The head is the adverb quietly, so this is an adverb phrase.
Compare them in sentences:
The room became very quiet.
She closed the door very quietly.
The first phrase describes the subject room. The second tells us how the action happened.
Adjective Phrase vs Participial Structure
Participial forms can behave more like adjectives in some sentences and more like verbs in others.
Compare:
The audience seemed deeply bored.
Here, bored behaves adjectivally, and deeply bored can be treated as an adjective phrase.
Now consider:
Waiting near the entrance, the visitors checked their tickets.
Here, waiting near the entrance expresses an accompanying action and has stronger verbal characteristics.
You may see structures like this called either a participial phrase or a participial clause, depending on the grammar source.
The important point is that an -ing or -ed form should not automatically be treated as an adjective. What it is doing in the sentence matters.
For a closer look at that boundary, see participial adjectives.
Adjective Phrase vs Adjective Clause
An adjective phrase does not have the kind of subject-and-finite-verb structure found in a clause.
Compare:
the students eager to begin
the students who were eager to begin
Eager to begin is an adjective phrase headed by eager.
Who were eager to begin is a clause because it contains its own subject who and finite verb were.
Both add information about students, but their structures are different.
Same Function, Different Structure
Different grammatical structures can do a similar job in a sentence.
Compare:
the house on the hill
the house that overlooks the river
the house extremely difficult to maintain
Each highlighted expression adds information about house, but each is built differently:
- on the hill is a prepositional phrase;
- that overlooks the river is a relative clause;
- extremely difficult to maintain is an adjective phrase.
This is why describing a noun is not enough by itself to identify an adjective phrase. Structure matters too.
Once you start looking for the head adjective and separating structure from function, adjective phrases become much easier to recognize.
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