Adjectives describe or give information about nouns or pronouns.
For example:-
The grey dog barked. (The adjective grey describes the noun "dog".)
The good news is that the form of an adjective does not change. It does not matter if the noun being modified is male or female, singular or plural, subject or object.
Some adjectives give us factual information about the noun - age, size colour etc (fact adjectives - can't be argued with). Some adjectives show what somebody thinks about something or somebody - nice, horrid, beautiful etc (opinion adjectives - not everyone may agree).
If you are asked questions with which, whose, what kind, or how many, you need an adjective to be able to answer.
There are different types of adjectives in the English language:
- Numeric: six, one hundred and one
- Quantitative: more, all, some, half, more than enough
- Qualitative: colour, size, smell etc.
- Possessive: my, his, their, your
- Interrogative: which, whose, what
- Demonstrative: this, that, those, these
!Note - The articles a, an, and the and the possessives my, our, your, and their are also adjectives.
Opinion
Adjectives can be used to give your opinion about something.
good, pretty, right, wrong, funny, light, happy, sad, full, soft, hard etc.
For example:
He was a silly boy.
Size
Adjectives can be used to describe size. 
big, small, little, long, tall, short, same as, etc.
For example:
- "The big man." or "The big woman".
Age
Adjectives can be used to describe age. 
For example:
- "He was an old man." or "She was an old woman."
Shape
Adjectives can be used to describe shape.
round, circular, triangular, rectangular, square, oval, etc.
For example:
- "It was a square box." or "They were square boxes."
Colour
Adjectives can be used to describe colour.
blue, red, green, brown, yellow, black, white, etc.
For example:
- "The blue bag." or "The blue bags".
Origin
Adjectives can be used to describe origin.
For example:-
- "It was a German flag." or "They were German flags."
Material
Adjectives can be used to describe material. 
- "It was a cotton cushion." or "They were cotton cushions."
Distance
Adjectives can be used to describe distance. l -- o -- n -- g / short
long, short, far, around, start, high, low, etc.
For example:
- "She went for a long walk." or "She went for lots of long walks."
Temperature
Adjectives can be used to describe temperature.
cold, warm, hot, cool, etc.
For example:
- "The day was hot." or "The days were hot."
Time
Adjectives can be used to describe time. 
late, early, bed, nap, dinner, lunch, day, morning, night, etc.
For example:
- "She had an early start."
Purpose
Adjectives can be used to describe purpose. (These adjectives often end with "-ing".)
For example:
- "She gave them a sleeping bag." or "She gave them sleeping bags."
!Note - In each case the adjective stays the same, whether it is describing a masculine, feminine, singular or plural noun.
When using more than one adjective to modify a noun, the adjectives may be separated by a conjunction (and) or by commas (,).
For example:
- "Her hair was long and blonde." or "She had long, blonde hair."
More examples:
| Adjective | Pretty | Serious | Fast | Quiet |
|---|---|---|---|---|
| Example | She was a pretty girl. | He was a serious boy. | It was a fast car. | They were quiet children. |
!Note - Adjectives that go immediately before the noun are called attributive adjectives.
Adjectives can also be used after some verbs. They do not describe the verb, adverbs do that. Adjectives after a verb describe the subject of the verb (usually a noun or pronoun). They are called predicative adjectives.
For example:
- "David looks tired." The subject (in this case David) is being described as tired not the verb to look.
There is also the adjective used to, which is explained here.
