A compound adjective is formed when two or more adjectives are joined together to modify the same noun. These terms should be hyphenated to avoid confusion or ambiguity. For example:
1.Diana submitted a 6-page document.
2 She adopted a two-year-old cat.
Examples of compound adjectives
1.This is a four-foot table.
2 Daniella is a part-time worker.
3 This is an all-too-common error.
4 Beware of the green-eyed monster.
5.He is a cold-blooded man.
6I love this brightly-lit room!
7. Danny’s dog is well-behaved.
8. You have to be open-minded about things.