An adjective goes in front of a noun to tell more about the noun. We say that an adjective modifies a noun.
The mail carrier delivered a large box.
The word box is a noun. The word large is an adjective. Large goes in front of the noun box and tells us more about the box. It’s not just a box. We now know that it’s a large box. Adjectives tell us more about the nouns in our sentences.
Here are more adjectives that tell the size of a noun:
big, huge, enormous, giant, small, puny, tiny, miniscule, dinky, long, short, lengthy, few
These sentences use adjectives telling the size of a noun:
Look at the enormous elephant!
The tiny mouse needs to stay away from the giant cat.
I read this short book in just a few hours.
The lengthy trip exhausted me.
Adjectives go in front of a noun to modify the noun. Some adjectives modify a noun by telling the size of the noun.