Not keeping eye contact
As Forbes states, in non-verbal communication wandering eyes and a failure to maintain eye contact shows a lack of confidence, fear, or an attempt to hide something.
Absence of a smile
A smile indicates kindness and confidence. Someone who is smiling is usually neither fearful nor nervous. Smile at people you are talking to, and you will seem more trustworthy.
Bad posture
Someone who slouches, has a bad posture and generally tries to be as visually small as possible, comes across as lacking confidence and wanting to be somewhere else instead.
Nervous gestures
Foot tapping, hand rubbing, touching one's face: all these signals indicate a nervousness that will definitely undermine any vision you are trying to convey.
Exaggerated gestures
Exaggerated gestures have a similar effect to nervous gestures. If, for instance, you focus too much on the power of your grip when shaking someone's hand and are desperately trying to look confident, you will paradoxically come across as someone who is afraid of people seeing through them and knowing they are not what they would like to be.
Not paying attention
When showing empathy and communicating effectively, it is essential you pay attention to the person you are talking to. Devote full attention to whomever you are communicating with at any given time.
Being too close
Different situations require different distance between the parties involved in the communication. Don't try to be too close to people you have a professional relationship with: you would seem odd or even aggressive.
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