It depends what your talking about, body langauge, levelvet of eye conact, and tone of voice are methods of indirect communication that are subconscious, every human being does them. It shows if a person is comfortable in a situation or not and is a very important part of communication. Have you ever gotten the feeling somebody just didn't like you or felt uncomfortable around you? Look at their body language closely and you'll undoubtly see a connection. The opposite is also true and it's a way to subconsciously tell how a person feels about your company. 90% of communication is non-verbal.

Indirect communication such as passive aggressive comments and sarcasm I do not condone. It's best to be straight up and honest with your words.