What Is an Adjective? Definition, Types and Examples

An adjective is a word that modifies a noun or pronoun by adding information about it – which one, what kind, how many, or whose. In a cracked screen, cracked is the adjective and screen is the noun it modifies.

That definition is the one most people are taught, and it is not quite enough. “Describes a noun” also fits a relative clause, a prepositional phrase, and a noun used attributively. If you want to identify adjectives reliably rather than recognise the obvious ones, you need a test.

The test that actually works

A word is behaving as an adjective if it can do both of these:

Sit directly in front of a noun – a cracked screen
Sit after a linking verb and still point back to that noun – the screen is cracked

Most true adjectives pass both. Tired, blue, enormous, Danish all work in either slot. Words that only manage the first are usually nouns doing an adjective’s job – you can say a kitchen table but not the table is kitchen.

A second check catches the rest: if you can put very in front and the phrase still makes sense, you are almost certainly looking at an adjective. Very tired works. Very kitchen does not. This test has a known exception – absolute adjectives like dead, unique, and impossible reject very because they name a state that has no degrees – but it sorts out the everyday cases quickly.

The eight types

Type	What it tells you	Examples
Descriptive	What kind	a quiet street, bitter coffee
Possessive	Whose	my keys, their decision
Demonstrative	Which one	this chair, those letters
Quantitative	How many or how much	three attempts, enough time
Interrogative	Asks which	which route, whose coat
Proper	Derived from a proper noun	Italian marble, Victorian tiles
Compound	Two or more words acting as one	a well-known case, a five-year plan
Participial	Formed from a verb	a running tap, a broken promise

Proper adjectives keep their capital letter – French bread, Shakespearean tragedy – which is one of the few places where adjective choice affects capitalisation. Compound adjectives usually take a hyphen before the noun and drop it afterwards: a well-known case, but the case is well known.

Where adjectives sit

English gives adjectives two homes, and the choice is not always free.

Attributive position puts the adjective in front of its noun: a difficult question. Predicate position puts it after a linking verb: the question was difficult. Most adjectives take either, but a stubborn group insists on one. Main, utter, and former refuse the predicate slot – nobody says the reason was main. Asleep, afraid, and alone refuse the attributive one – the asleep child is wrong, and you need the sleeping child instead.

When several adjectives stack in front of one noun, English enforces an order that native speakers follow without being able to state it: opinion, size, age, shape, colour, origin, material, purpose. A lovely little old rectangular brown Italian leather writing desk sounds right; shuffle any two and it sounds broken.

Three things adjectives are regularly confused with

Adverbs. An adjective modifies a noun; an adverb modifies a verb, an adjective, or another adverb. She is a careful driver takes an adjective, because careful describes the driver. She drives carefully takes an adverb, because carefully describes the driving. The -ly ending is not a reliable guide – friendly, lovely, and lonely are adjectives.

Nouns doing the work. In bus stop, bus modifies stop, but it has not become an adjective. It cannot take very, cannot compare, and cannot follow a linking verb.

Participles. Broken in a broken promise is an adjective. In he has broken the promise, the same word is part of the verb. Position and function decide, not spelling.

Quick reference

Question	Answer
What does an adjective do?	Adds information to a noun or pronoun
Fastest test?	Can it follow very, and can it sit both before a noun and after is?
Do adjectives change form?	Only for comparison – tall, taller, tallest
Can a noun act as one?	Yes, attributively, but it stays a noun
Do they ever take capitals?	Yes, when derived from a proper noun

Adjectives are the easiest part of speech to define loosely and the hardest to pin down precisely, because English lets so many other words borrow their job. When a word is ambiguous, stop asking what it looks like and ask what it is doing in that sentence.