Adjectives

Intuition [Beginner]

An adjective describes a noun. It tells you what kind, which one, or how many. "The tall building." "She wore a red dress." "I have three cats."

Adjectives add detail. Without them: "The dog barked." With them: "The small brown dog barked loudly." (The last word, "loudly," is an adverb -- it describes how the dog barked. Adjectives describe nouns; adverbs describe verbs. More on adverbs in 22.01.06 pending.)

Think of adjectives as paint. The noun is the shape; the adjective is the colour you add.

Visual [Beginner]

What kind?    Which one?    How many?
  tall          this          three
  cold          that          many
  happy         these         several
  broken        those         few
  wooden        last          all
  empty         next          no

Every word in those columns is an adjective. The question each answers tells you its job in the sentence.

Worked example [Beginner]

Find the adjectives: "The hungry cat ate the small fish on the old wooden table."

• hungry -- what kind of cat
• small -- what kind of fish
• old -- what kind of table
• wooden -- what kind of table

"The," "the," "on," "the" are not adjectives. "Cat," "fish," and "table" are nouns. "Ate" is a verb. The adjectives are the words that describe the nouns.

What this tells us: adjectives answer "what kind?" "which one?" or "how many?" about a noun.

Check your understanding [Beginner]

Formal definition [Intermediate+]

An adjective is a word that modifies a noun or pronoun, providing information about its qualities, quantities, or identifying properties. In English, adjectives are the word class that:

1. Can be attributive (directly before a noun): "a cold day"
2. Can be predicative (after a linking verb): "the day is cold"
3. Can be postpositive (after the noun, in restricted contexts): "something special"
4. Can be graded with degree modifiers: "very cold," "too cold," "colder," "coldest"

Attributive and predicative positions

Most adjectives work in both positions:

• Attributive: "a heavy box"
• Predicative: "the box is heavy"

Some adjectives are restricted:

• Attributive only: "the main reason" (not "the reason is main"), "an utter disaster"
• Predicative only: "the baby is asleep" (not "an asleep baby"), "she is afraid" (not "an afraid girl")

Degrees of comparison

Adjectives express three degrees:

• Positive (base form): tall
• Comparative (comparing two): taller (or more beautiful)
• Superlative (comparing three or more): tallest (or most beautiful)

Short adjectives (one syllable) typically use -er/-est: tall, taller, tallest. Longer adjectives typically use more/most: beautiful, more beautiful, most beautiful.

Irregular comparisons: good/better/best, bad/worse/worst, little/less/least, much/more/most.

Coordinate adjectives

When two or more adjectives modify the same noun independently, they are coordinate and separated by commas: "a long, cold winter." The comma signals that both adjectives describe the winter equally. You can test this by reversing them ("a cold, long winter") or inserting "and" ("a long and cold winter") without changing the meaning.

When adjectives build on each other hierarchically, no comma is used: "a small wooden box." "Wooden" describes what kind of box; "small" describes the wooden box. You would not say "a wooden small box."

Counter-examples to common slips

• Not every word ending in -ly is an adverb. "A friendly dog" -- "friendly" is an adjective. The -ly suffix does not guarantee adverb status.
• Not every word between "the" and a noun is an adjective. "The bank teller" -- "bank" is a noun used as a modifier (a noun adjunct).
• Possessive pronouns are not adjectives. "My book" -- "my" is a possessive determiner, not an adjective, despite occupying the same slot.

Linguistic theory [Master]

The adjective category cross-linguistically

Not all languages have a distinct adjective class. Dixon (2004) identifies a typological spectrum:

• Large open adjective classes: English, Mandarin -- thousands of adjectives, easily coined
• Small closed adjective classes: Japanese, Korean -- a few dozen native adjectives; other descriptive words are verbs or nouns
• No distinct adjective class: Some languages (e.g., Igbo) treat property words as a subset of verbs: "the ball red-s" means "the ball is red"

Where a distinct adjective class exists, Dixon finds that it tends to contain words from four semantic core types: dimension (big, small), age (new, old), value (good, bad), and colour (red, blue). Other semantic types (physical property, human propensity, speed) vary more in whether they are encoded as adjectives or as other word classes across languages.

Adjective ordering

English has a strong preferred ordering for prenominal adjectives, often described as the "royal order":

$$\text{opinion}>\text{size}>\text{age}>\text{shape}>\text{colour}>\text{origin}>\text{material}>\text{purpose}$$

"A beautiful large old round red Italian marble dining table." Changing the order sounds wrong to native speakers ("a red beautiful table") even though no rule of grammar is explicitly violated. This ordering reflects semantic compositionality: each adjective narrows the reference set of the noun phrase it modifies. Opinions are the most subjective and scope the widest; material and purpose are the most objective and scope the narrowest.

Adjectives as predicates vs modifiers

In formal semantics, an adjective denotes a property -- a function from individuals to truth values, just like an intransitive verb. "Red" corresponds to $\lambda x.red(x)$. When used attributively ("a red ball"), the adjective composes with the noun via intersective modification: $red(x)\wedge ball(x)$. The set of red balls is the intersection of red things and balls.

Not all adjectives are intersective. "A former president" is not someone who is both former and a president -- "former" is a non-intersective (or intensional) adjective that modifies the noun's reference rather than intersecting with it. This distinction is central to formal semantics and connects to the intensional logic units in the philosophy strand.

Connections

The intersective model of adjective modification parallels set intersection in mathematics: $A\cap B$ where $A$ is the set of red things and $B$ is the set of balls. The non-intersective case requires more sophisticated machinery (possible worlds, intensions) that connects to modal logic and the philosophy of language.

Historical context [Master]

Old English adjectives were heavily inflected, agreeing with the noun they modified in gender, number, and case. "Good" had over a dozen forms depending on whether it modified a masculine, feminine, or neuter noun, in singular or plural, in nominative, accusative, genitive, or dative case. This inflectional system collapsed during the Middle English period, leaving Modern English with only the degree markers (-er/-est) and no agreement morphology. The loss of inflection made English adjectives syntactically simpler but placed a heavier burden on word order and function words to signal grammatical relationships.

Bibliography [Master]

• Baker, M. (2003). Lexical Categories: Verbs, Nouns, and Adjectives. Cambridge University Press.
• Dixon, R. M. W. (2004). "Adjective Classes in Typological Perspective." In R. M. W. Dixon & A. Y. Aikhenvald (Eds.), Adjective Classes: A Cross-Linguistic Typology. Oxford University Press.
• Huddleston, R. & Pullum, G. K. (2002). The Cambridge Grammar of the English Language. Cambridge University Press.