Giving a quick look and suddenly looking away, and then back to eye contact is a form of flirting and sign of interest. Looking from the eyes down to the lips and back to the eyes again also indicates romance. Other gestures can also be signs of attraction, such as if the person is facing you directly or leaning towards you.
You can also read from another person's actions if he or she is neither attracted nor interested. A hard look or glare could state “back off” louder than mouthing the words. Never taking a peek, looking away, keeping the mouth shut the entire time, turning the body away, shuffling of feet, fiddling with things, staring at people other than you, a neutral or passive expression, unfocused attention, crossing the arms, and moving away are just some of the clues that he or she is not interested to have a romantic encounter with you.
You do not need to investigate to determine if somebody is being dishonest to you. All you need is knowledge in understanding body language to spot lies. The simplest way to detect lies is to simply look for signs of discomfort, anxiety, and nervousness. Inability to look directly to the eyes, fidgeting with the fingers, shuffling of the feet, sudden crossing of the arms or legs, glancing around the room, and forced smiles are the most common clues of lying.
Be Careful And Observant
To give a proper impression to a lover, boss, co-worker, friend, or even a stranger, you must know how and when to use your own body language. Be careful in making gestures; other people may misinterpret them. And likewise, observe other people's actions as well to know how to correctly react to them.