When using multiple adjectives think about how they go together and if that's what you really want to say, and if that's the best way of saying it. Too often I've seen people use one adjective to modify another (which is OK), but in a way that really screws up what they're saying; in most cases a change of words would make it better.
What brought this on is today I was reading one of my older paperback action pocketbook novels by an Aussie author from the 1930s to 1960s - journalist and author with hundreds of books to his credit, and this was one of his later books. I read a phrase and my immediate thought was: what the heck did he think he was trying to say with that then realised it's likely the first draft had a single adjective and a modifying one was added later. It's clear he didn't go back and re-read the whole sentence, or he may have just had a brain fart that day. However, I've often seen the same two adjectives used the same way in stories at SOL.
What did he do wrong, you may ask: he said ... it was almost exactly three o'clock when ...
Almost exactly - both are adjectives and they mean almost the opposite of each other, but like this it makes the author look stupid. He should've said something like: ... it was just on three o'clock ... or something similar to imply the same few minutes to three o'clock.
When I thought about this I remember seeing other double adjective uses in stories at SOL that had me stopping to wonder WTF the author thought they were saying. You should use adjectives, and often using others as modifiers is good, but please think about what the final effect is.