When an INFJ is flirting, there are several key signs and behaviors to look out for. It's important to note that INFJs are often subtle and cautious when it comes to expressing their romantic interest, so their flirting style may differ from more overt approaches. Here are some detailed descriptions of how you can tell if an INFJ is flirting:

1. Deep and Meaningful Conversations: INFJs are known for their love of deep and intellectual conversations. When they are interested in someone, they will engage in conversations that go beyond small talk. They will ask thought-provoking questions, actively listen, and show genuine interest in the other person's thoughts and feelings.

2. Intense Eye Contact: INFJs tend to maintain strong eye contact when they are attracted to someone. They will look into your eyes with a sense of curiosity and warmth. Their gaze may feel intense and focused, as they try to establish a deeper connection with you.

3. Emotional Availability: INFJs are highly empathetic individuals who value emotional connection. When flirting, they will create a safe and comfortable space for you to express your emotions. They will listen attentively, offer support, and show understanding. They may also share personal stories or vulnerabilities to establish a deeper emotional bond.

4. Thoughtful Gestures: INFJs are known for their thoughtfulness and consideration towards others. When flirting, they will go out of their way to do kind and thoughtful gestures for you. This could include remembering small details about your preferences, surprising you with small gifts, or offering help when you need it.

5. Nervousness and Shyness: Despite their warm and confident exterior, INFJs can become nervous and shy when they are attracted to someone. They may fidget, blush, or stumble over their words. This is because they fear rejection and want to make a good impression. Pay attention to any signs of nervousness or shyness when you're around them.

6. Physical Touch: INFJs may use subtle physical touch as a way to flirt. This could include light touches on the arm, brushing against you accidentally, or finding excuses to be physically close to you. They may also be more comfortable with physical touch when they feel a strong connection with someone.

7. Protective Behavior: INFJs have a natural inclination to protect and care for others. When they are interested in someone romantically, they may display protective behavior. They will offer support, provide advice, and ensure your well-being. They may also show concern if they perceive any threats or difficulties in your life.

8. Increased Availability: INFJs are generally private individuals who value their alone time. However, when they are interested in someone, they will make an effort to spend more time with them. They may initiate conversations, suggest activities or outings, and try to create opportunities for further interaction.

It's important to remember that INFJs are complex individuals, and their flirting style may vary depending on their personality and individual preferences. These signs can provide a general understanding, but it's always best to communicate openly and directly with the INFJ to understand their intentions and feelings.