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:
Note that combining an adverb and an adjective does not create a compound adjective. No hyphen is required because it is already clear that the adverb modifies the adjective rather than the subsequent noun. For example:
In addition, you should not place a hyphen in a compound adjective if the adjectives are capitalized, such as when they are part of a title.