When an INFP becomes angry, their behavior and demeanor can change significantly. Here is a detailed description of how an INFP may behave when angry:

1. Internalizing emotions: INFPs are known for their tendency to internalize their emotions, and this is no different when they are angry. They may initially keep their anger to themselves, not wanting to burden others or create conflict.

2. Withdrawal: INFPs are introverted and may withdraw from social interactions when angry. They may isolate themselves to process their emotions and regain their inner balance. During this time, they may become quiet, distant, and unresponsive.

3. Heightened sensitivity: INFPs are highly sensitive individuals, and when angry, their sensitivity can become even more pronounced. They may be easily triggered by small things that wouldn't usually bother them, and their emotional reactions can be intense.

4. Passive-aggressiveness: Instead of expressing their anger directly, INFPs may resort to passive-aggressive behavior. They may make sarcastic remarks, give the silent treatment, or engage in subtle acts of defiance to express their displeasure.

5. Idealistic anger: INFPs have strong values and ideals, and when these are violated, their anger can be fueled by a sense of injustice. They may become passionate advocates for what they believe is right, expressing their anger through articulate arguments and standing up for their principles.

6. Emotional outbursts: Although INFPs typically avoid conflict, when their anger reaches a boiling point, they may experience emotional outbursts. These outbursts can involve crying, yelling, or expressing their anger in an intense and uncharacteristic manner.

7. Self-criticism: INFPs have a tendency to be self-critical, and when angry, they may turn their anger inward. They may blame themselves for the situation, questioning their own actions and decisions, which can lead to feelings of guilt and self-doubt.

8. Difficulty expressing anger: INFPs may struggle to express their anger directly and assertively. They may find it challenging to confront others or communicate their feelings openly, often fearing that their anger will damage their relationships or cause conflict.

9. Need for resolution: INFPs value harmony and peace, so when they are angry, they typically seek resolution. They may try to find a compromise or a way to reconcile their differences, as they genuinely want to restore harmony and maintain positive relationships.

It's important to note that not all INFPs will exhibit these behaviors when angry, as individuals can vary greatly. Additionally, the intensity and duration of their anger can also differ depending on the situation and the individual's personal growth and development.