This is from Harvard Business Review
In an ideal world, your colleagues would give you direct, honest feedback. But if they’re not forthcoming, often you can find out what someone really thinks by watching their nonverbal cues. Learn to read facial expressions and body language to understand how your words and actions are being received. When people look down or avoid eye contact with you, when a typically engaging colleague is quiet, or when an even-keeled coworker gets defensive, pay attention and graciously point out your observation. You might say, “Tell me how I should interpret your silence,” or “I’m concerned that something I’ve said isn’t sitting well with you. Is that true?” These polite statements and questions invite others to be more open about how they’re reacting to you, which can help you make crucial adjustments to your behavior and deepen trust between you and your colleagues.