This is a definite numeral adjective. Numeral adjectives tell us about how many, how much, or what order.

Comparative adjectives make comparisons between two or more people or objects or they are used to indicate change.

Interrogative adjectives are question words that modify nouns or noun phrases. They can't stand on their own (unlike interrogative pronouns) and so they are classed as adjectives.

Distributive adjectives are used to refer to members of a group as individuals.

If participles modify nouns, they are adjectives ('worried' is modifying 'he'). Participles are words that usually end in -ed or -ing and derive from verbs.

Superlative adjectives are used to point to a noun that has the most extreme quality or attributes amongst three (or more) other nouns.

Compound adjectives join more than one word into a single lexical unit, which then modifies a noun. They are usually (though not always) separated by a hyphen or joined by quotation marks.

Proper adjectives are the adjective form of proper nouns. A proper noun begins with a capital letter and is the name of a particular person, place, organisation, or thing.

Demonstrative adjectives include the words: this, that, these, those. These types of adjective are used to point out which person or thing is being referred to.

Possessive adjectives are used with nouns to talk about possession and ownership. They are: my, your, his, her, its, our, their.