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In grammar, an adjective is a word whose main syntactic role is to qualify a noun or noun phrase, giving more information about the object signified.
Adjectives are one of the traditional eight English parts of speech, though linguists today distinguish adjectives from words such as determiners that were formerly considered to be adjectives. In this paragraph, "traditional" is an adjective, and in the preceding paragraph, "main" and "more" are.
Most but not all languages have adjectives. Those that do not typically use words of another part of speech, often verbs, to serve the same semantic function; for example, such a language might have a verb that means "to be big", and would use a construction analogous to "big-being house" to express what English expresses as "big house". Even in languages that do have adjectives, one language's adjective might not be another's; for example, while English uses "to be hungry" (hungry being an adjective), Dutch and French use "honger hebben" and "avoir faim" respectively (literally "to have hunger", hunger being a noun), and where Hebrew uses the adjective "זקוק" (zaqūq, roughly "in need of"), English uses the verb "to need".
Adjectives form an open class of words in most languages that have them; that is, it is relatively common for new adjectives to be formed via such processes as derivation. However, Bantu languages are well known for having only a small closed class of adjectives, and new adjectives are not easily derived.
In English, the word "adjective" is frequently used loosely for any part of speech, including nouns and prepositions, when it is used attributively. See adjectival phrase.
Linguists today distinguish determiners from adjectives, considering them to be two separate parts of speech (or lexical categories), but formerly determiners were considered to be adjectives in some of their uses. In English dictionaries, which typically still do not treat determiners as their own part of speech, determiners are often recognizable by being listed both as adjectives and as pronouns. Determiners are words that are neither nouns nor pronouns, yet reference a thing already in context. Determiners generally do this by indicating definiteness (as in a vs. the), quantity (as in one vs. some vs. many), or another such property.
An adjective acts as the head of an adjectival phrase. In the simplest case, an adjectival phrase consists solely of the adjective; more complex adjectival phrases may contain one or more adverbs modifying the adjective ("very strong"), or one or more complements (such as "worth several dollars", "full of toys", or "eager to please"). In English, attributive adjectival phrases that include complements typically follow their subject ("an evildoer devoid of redeeming qualities").
Many languages have special verbal forms called participles can act as noun modifiers. In some languages, including English, there is a strong tendency for participles to evolve into adjectives. English examples of this include relieved (the past participle of the verb relieve, used as an adjective in sentences (such as "I am so relieved to see you"), spoken (as in "the spoken word"), and going (the present participle of the verb go, used as an adjective in sentences such as "Ten dollars per hour is the going rate").
Other constructs that often modify nouns include prepositional phrases (as in English "a rebel without a cause"), relative clauses (as in English "the man who wasn't there"), other adjective clauses (as in English "the bookstore where he worked"), and infinitive phrases (as in English "cake to die for").
In relation, many nouns take complements such as content clauses (as in English "the idea that I would do that"); these are not commonly considered modifiers, however.
So, in English, adjectives pertaining to size precede adjectives pertaining to age ("little old", not "old little"), which in turn generally precede adjectives pertaining to color ("old white", not "white old"). So, we would say "A nice (opinion) little (size) old (age) white (color) brick (material) house".
This order may be more rigid in some languages than others; in some, like Spanish, it may only be a default (unmarked) word order, with other orders being permissible.
Due partially to borrowings from French, English has some adjectives which follow the noun as postmodifiers, called post-positive adjectives, such as time immemorial. Adjectives may even change meaning depending on whether they precede or follow, as in proper: They live in a proper town (a real town, not a village) vs. They live in the town proper (in the town itself, not in the suburbs). All adjectives can follow nouns in certain constructions, such as tell me something new.
In many languages, adjectives can be compared. In English, for example, we can say that a car is big, that it is bigger than another is, or that it is the biggest car of all. Not all adjectives lend themselves to comparison, however; for example, the English adjective extinct is not considered comparable, in that it does not make sense to describe one species as "more extinct" than another. However, even most non-comparable English adjectives are still sometimes compared; for example, one might say that a language about which nothing is known is "more extinct" than a well-documented language with surviving literature but no speakers. This is not a comparison of the degree of intensity of the adjective, but rather the degree to which the object fits the adjective's definition.
Comparable adjectives are also known as "gradable" adjectives, because they tend to allow grading adverbs such as very, rather, and so on.
Among languages that allow adjectives to be compared in this way, different approaches are used. Indeed, even within English, two different approaches are used: the suffixes -er and -est, and the words more and most. (In English, the general tendency is for shorter adjectives and adjectives from Anglo-Saxon to use -er and -est, and for longer adjectives and adjectives from French, Latin, Greek, and other languages to use more and most.) By either approach, English adjectives therefore have positive forms (big), comparative forms (bigger), and superlative forms (biggest). However, many other languages do not distinguish comparative from superlative forms.
Attributive adjectives, and other noun modifiers, may be used either restrictively (helping to identify the noun's referent, hence "restricting" its reference), or non-restrictively (helping to describe an already-identified noun). In some languages, such as Spanish, restrictiveness is consistently marked; for example, in Spanish la tarea difícil means "the difficult task" in the sense of "the task that is difficult" (restrictive), while la difícil tarea means "the difficult task" in the sense of "the task, which is difficult" (non-restrictive). In English, restrictiveness is not marked on adjectives, but is marked on relative clauses (the difference between "the man who recognized me was there" and "the man, who recognized me, was there" being one of restrictiveness).
:{|border=0 |puella bona ||rowspan=4 style="width:30px"| || (good girl, feminine) |- |puellam bonam || (good girl, feminine accusative/object case) |- |puer bonus || (good boy, masculine) |- |pueri boni || (good boys, masculine plural) |}
In the Celtic languages, however, initial consonant lenition marks the adjective with a feminine noun, as in Irish:
:{|border=0 |buachaill maith ||rowspan=4 style="width:30px"| || (good boy, masculine) |- |cailín mhaith || (good girl, feminine) |}
Often a distinction is made here between attributive and predicative usage. Where English is an example of a language where adjectives never agree and French of a language where they always agree, in German they agree only when used attributively, and in Hungarian only when used predicatively.
:{|border=0 |The good (Ø) boys. ||rowspan=4 style="width:30px"| || The boys are good (Ø). |- |Les bons garçons. || Les garçons sont bons. |- |Die braven Jungen. || Die Jungen sind brav (Ø). |- |A jó (Ø) fiúk. || A fiúk jók. |}
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