Before the first word has been uttered, confidence is generally estimated. The daily patterns, body language, and communication style silently indicate the feeling of being safe or insecure in work and social environments. Most of these behaviours have appeared to be subtle and though they may seem harmless, they do play a role in bringing about an aspect of competence, authority and trustworthiness in the eyes of others. Understanding little errors that individuals tend to make in day-to-day interactions will allow demonstrating confidence on a more convincing level and creating a more powerful confident image.
Avoid Weak Eye Contact

Eye contact also signals the attention, honesty and self confidence, and most people always fail to maintain eye contact during conversations due to nervousness or distraction. Turning your back too frequently may lead people to believe that you do not know what you are talking about or are not attentive even when you are really good in your subject.
An Apology Without Excuse

Always apologizing over minor or unnecessary things may undermine the reception of whatever you say during professional and normal life situations. When used in excess they make one appear to be guilty of issues that are not there or not to be confident in what they are doing.
Speaking Too Softly Often

A voice that is always too soft makes others work hard to hear it and it may automatically lead to the perception of indecisiveness or insecurity. You have the ability to speak clearly and at a reasonable voice, this enables your ideas to be authoritative and you ensure people are focused on what you are saying and not struggling to listen to you.
Had a bad posture when talking

Shoulders bent forward, eyes low or turned away convey pain or lack of confidence very easily. Sitting or standing up with very loose shoulders is recommended to create an impression of a calming control and make you look more engaged and attentive.
Rushing Words Too Quickly

When individuals experience some form of pressure or nervousness they tend to talk at a faster rate than they are used to without having the awareness of the change in speed. A quick pace will cause ideas to appear unsure or uncoherent whereas a slow and constant pace will make your words clearer and more effective.
Fidgeting Hands And Objects

Flicking of fingers, fiddling with clothes or touching objects nearby can distract other people and are an indication of tension within oneself. Hands moved slowly and steadily give the impression of calm and dignity in your communication and make your speech more assertive and intentional.
Not Making Direct Statements

Others overly qualify their views with irrelevant words and phrases due to the fear of being too pushy. Being direct and clear to your words is what makes you get your point across in a very little time and makes other people realize that you have confidence in yourself.
Expounding Simple Basic Points

Giving too much information on simple ideas can have the unintended implication of not being certain that the listener comprehends you. It is important to be brief with your explanations because you are sure that you know the subject and that the audience can understand your arguments.
Looking at the Cell Phone in the middle of the conversation

Looking at the phone during the conversation is the indicator of divided attention even in those cases, when the interruption does not take much time (several seconds). Listening to another person with all your attention shows that you respect them and helps to create the impression that you are in this interaction and that you are sure it is not something.
Lack Of Facial Expression

The face of total neutrality may be construed in some cases to mean lack of interest or indecisiveness. Natural gestures like nodding and even smiling can also be used to demonstrate interest and reinforce the bond you are having with the individual you are talking to.
Minimizing Accomplishments and Competences

Most individuals undermine their achievements because they want to seem simple or they do not want to attract attention. Being able to recognize your skills in an unbiased and objective manner will indicate that you are proud of the work you do and confident in your experience.
Hacking Yourself When you are talking

Continuing to interrupt yourself to fix what is being said can make it sound unsure as well when you are having a good idea. Leaving yourself to complete a point then tweak details helps you stay on point and also stay on track of confidence.
Even overlooking Personal Appearance Details

Even little details like crumpled clothes, messy arrangement and unnoticed details can have more impact on first impressions than many individuals realize. Giving attention to minor grooming and presentation decisions will contribute to a strong image that will align with the message you want to send people.