5. Nervous Gestures
Be aware of nervous gestures so you can either keep your distance or address what is making the other person nervous. Any of these could be an indication that they are uncomfortable with a suggestion or idea.
If someone plays with their hair a lot while you are talking or raises their eyebrows then it could be an indication that they are nervous or disagree with you. If the other person is wearing glasses and constantly adjusting them without much reason then this could also indicate nervousness.