The biggest fear of an INFJ, also known as the Advocate or the Counselor, is often related to their deep sense of empathy and their desire to make a positive impact on the world. INFJs are known for their ability to understand and connect with others on a profound level, and they often prioritize the needs of others over their own. However, this can also lead to certain fears and anxieties.

1. Being Misunderstood: INFJs have a complex inner world and often feel like they don't fit into societal norms. They fear that others may not fully understand or appreciate their unique perspectives, values, and motivations. This fear can make them hesitant to express themselves openly, leading to a sense of isolation and loneliness.

2. Rejection and Abandonment: INFJs deeply value their relationships and invest a lot of emotional energy into them. They fear being rejected or abandoned by the people they care about, which can cause them to be overly cautious and guarded in forming new connections. This fear stems from their vulnerability and the fear of losing the deep emotional connection they crave.

3. Betrayal: INFJs have a strong sense of loyalty and trust, and they expect the same from others. They fear being betrayed by those they trust, whether it's a close friend, romantic partner, or even an organization they believe in. This fear can make them hesitant to fully open up and trust others, as they fear being taken advantage of or having their trust shattered.

4. Failure: INFJs have high standards for themselves and often set lofty goals. They fear failing to live up to their own expectations or not making a meaningful impact in the world. This fear can lead to perfectionism and self-doubt, as they constantly strive for excellence and fear falling short.

5. Conflict and Confrontation: INFJs value harmony and peace, and they often avoid conflict and confrontation. They fear being involved in intense conflicts or being forced to confront others, as it goes against their natural inclination to maintain harmony. This fear can make them hesitant to assert themselves or speak up when they feel their boundaries are being crossed.

Overall, the biggest fear of an INFJ revolves around their deep desire for connection, understanding, and making a positive impact. They fear being misunderstood, rejected, betrayed, failing to meet their own expectations, and being involved in conflicts. Understanding and addressing these fears can help INFJs navigate their personal and professional relationships more effectively and find fulfillment in their lives.