Our bodies have a language of their own, and their words aren’t always kind. Your body language has likely become an integral part of who you are, to the point where you might not even think about it.

If that’s the case, it’s time to start, because you could be sabotaging your career.

What follows are the 15 most common body language blunders that people make, and emotionally intelligent people are careful to avoid.

1. Slouching is a sign of disrespect. It communicates that you’re bored and have no desire to be where you are. You would never tell your boss, “I don’t understand why I have to listen to you,” but if you slouch, you don’t have to—your body says it for you, loud and clear.

The brain is hardwired to equate power with the amou nt of space people take up. Standing up straight with your shoulders back is a power position. It maximizes the amount of space you fill. Slouching, on the other hand, is the result of collapsing your form—it takes up less space and projects less power.

2. Turning yourself away from others, or not leaning into your conversation, portrays that you are unengaged, uninterested, uncomfortable, and perhaps even distrustful of the person speaking.

3. Exaggerated gestures can imply that you’re stretching the truth. Aim for small, controlled gestures to indicate leadership and confidence, and open gestures—like spreading your arms apart or showing the palms of your hands—to communicate that you have nothing to hide.

4. Crossed arms—and crossed legs, to some degree—are physical barriers that suggest you’re not open to what the other person is saying. Even if you’re smiling or engaged in a pleasant conversation, the other person may get a nagging sense that you’re shutting him or her out.

5. Clenched fists, much like crossed arms and legs, can signal that you’re not open to other people’s points. It can also make you look argumentative and defensive, which will make people nervous about interacting with you.

6. Inconsistency between your words and your facial expression causes people to sense that something isn’t right and they begin to suspect that you’re trying to deceive them, even if they don’t know exactly why or how.

7. Watching the clock while talking to someone is a clear sign of disrespect, impatience, and inflated ego. It sends the message that you have better things to do than talk to the person you’re with, and that you’re anxious to leave them.

8. Exaggerated nodding signals anxiety about approval. People may perceive your heavy nods as an attempt to show you agree with or understand something that you actually don’t.

9. Fidgeting with or fixing your hair signals that you’re anxious, over-energized, self-conscious, and distracted. People will perceive you as overly concerned with your physical appearance and not concerned enough with your career.

10. Avoiding eye contact makes it look like you have something to hide, and that arouses suspicion. Lack of eye contact can also indicate a lack of confidence and interest, which you never want to communicate in a business setting.  Looking down as you talk makes it seem like you lack confidence or are self-conscious, causing your words to lose their effect. It’s especially important to keep your eyes level if you’re making complicated or important points.  Sustained eye contact, on the other hand, communicates confidence, leadership, strength, and intelligence. While it is possible to be engaged without direct, constant eye contact, complete negligence will clearly have negative effects on your professional relationships.

11. Eye contact that’s too intense may be perceived as aggressive, or an attempt to dominate. On average, Americans hold eye contact for seven to ten seconds, longer when we’re listening than when we’re talking. The way we break contact sends a message, too. Glancing down communicates submission, while looking to the side projects confidence.

12. Rolling your eyes is a fail-proof way to communicate lack of respect. Fortunately, while it may be a habit, it’s voluntary. You can control it, and it’s worth the effort.

13. Scowling or having a generally unhappy expression sends the message that you’re upset by those around you, even if they have nothing to do with your mood. Scowls turn people away, as they feel judged.  Smiling, however, suggests that you’re open, trustworthy, confident, and friendly. MRI studies have shown that the human brain responds favorably to a person who’s smiling, and this leaves a lasting positive impression.

14. Weak handshakes signal that you lack authority and confidence, while a handshake that is too strong could be perceived as an aggressive attempt at domination, which is just as bad. Adapt your handshake to each person and situation, but make sure it’s always firm.

15. Getting too close. If you stand too close to someone (nearer than one and a half feet), it signals that you have no respect for or understanding of personal space. This will make people very uncomfortable when they’re around you.