Compound adjectives are made up of more than one word. They can be written as one word, as hyphenated words, or as separate words.

One word - worldwide, easygoing, underpaid, warmhearted

Hyphenated words - warm-blooded, long-legged, cone-shaped, narrow-minded

Separate words - hard up, whole wheat, top secret, number one

Adjectives formed with three or more words are usually hyphenated - down-to-earth, up-to-date

However, there is no definite rule and you may use any one style to form a compound adjective. If you are not sure which form to use, consult a good dictionary.

Remember not to mix up compound adjectives with compound nouns.