Substitute an adjective with a more specific noun or verb when possible. Sometimes this will completely eliminate the need for an adjective. For example, you can say "millionaire" instead of "rich man" or "study" instead of "look with an intense stare." Using adjectives can lessen the impact of a description, but replacing adjectives with specific nouns and verbs clarifies your writing and gives it more impact.
Use a thesaurus to make sure you are using the best adjective possible, and replace it with a better one if not. Limiting how many adjectives you have together makes the ones you choose more powerful. Your best bet is to use one, and more than two is overkill. You can usually find one adjective that can do the job of multiple adjectives. However, make sure you are clear on the connotations of the new word before you use it, by double-checking it with a dictionary.
Swap broad adjectives for specific ones, if it is necessary to use them at all. In writing you should show rather than tell, and specific adjectives do a much better job of that. A "beautiful star" can look many different ways, but a "bright star" gives the reader detail to work with. Specific adjectives leave less room for personal interpretation or confusion.
Space out your adjectives as an alternative to replacing them. The farther apart your adjectives are, the more impact they will have on your writing. Putting too many adjectives together weakens their impact and can even make them more difficult for the reader to decipher.
Delete adjectives as an alternative to replacing them. This is especially important when you are using an adjective to state the obvious, like a "small ant" or "green tree." If you are having trouble replacing an adjective and your sentence is not butchered by getting rid of it, then delete it. Mark Twain, as quoted on the Texas A&M University website, had the right idea when he said, "When in doubt, strike it out."