please tell me what is adjective

adjective 就是形容詞...
happy, lonely, large, slim, emotional...etc.
這些都是...

放在名詞(noun)之前~~~
作豐富名詞之用~~~
happy guy,
lonely christmas (陳奕迅!?),
large luggage,
slim girl,
emotional quotient...etc.

adjective = 形容詞，是一類用以修飾名詞的詞類，用以彰顯被修飾的名詞的特徵.

e.g.
you are a pretty girl.
你是一個漂亮的女孩.

pretty=漂亮的=(adjective)

Adjective
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Examples

An adjective is a describing word.

* That is a big building.
* I met a very old man.
* The quick brown fox jumps over the lazy dog.
* Most monkeys are arboreal creatures that inhabit tropical or subtropical areas.
* That's a very nice dress you are wearing.

In grammar, an adjective is a word whose main syntactic role is to modify a noun or pronoun (called the adjective's subject), giving more information about what the noun or pronoun refers to. Collectively, adjectives form one of the traditional eight parts of speech, though linguists today distinguish adjectives from words such as determiners that used to be considered adjectives but that are now recognized to be different.

Not all languages have adjectives, but most, including English, do. (English adjectives include big, old, and tired, among many others.) 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, where English has "to be hungry" (hungry being an adjective), French has "avoir faim" (literally "to have hunger"), and where Hebrew has the adjective "זקוק" (zaqūq, roughly "in need of"), English uses the verb "to need".

In most languages with adjectives, they form an open class of words; that is, it is relatively common for new adjectives to be formed via such processes as derivation.