Explanation:

Humbleness:
Humbleness refers to the quality of being modest or having a humble attitude. It is characterized by a lack of pride or arrogance. When someone is humble, they do not boast about their achievements or consider themselves superior to others. Instead, they show respect, kindness, and gratitude towards others.

Impression on the king:
The question states that the king was impressed by the shepherd's humbleness. This implies that the shepherd displayed a modest and humble attitude that caught the attention of the king. The shepherd's behavior and demeanor must have been in contrast to the common perception of a king, who is often associated with power, authority, and grandeur.

Reason for the king's impression:
There could be several reasons why the king was impressed by the shepherd's humbleness. Some possible reasons are:

1. Genuine nature: The shepherd's humble nature might have come across as genuine and sincere. It is possible that the king, who may be surrounded by flattery and false admiration, appreciated the shepherd's authenticity.

2. Humility in the face of power: The shepherd's ability to remain humble despite being in the presence of the king could have stood out to the king. It takes strength of character to maintain humility when faced with authority or wealth.

3. Contrast to the norm: The shepherd's humbleness might have been a refreshing change for the king. As a king, he might be used to interacting with individuals who are more concerned with power and status. The shepherd's humble attitude could have intrigued the king and made him take notice.

4. Empathy and simplicity: Humble individuals often exhibit empathy and simplicity in their actions and interactions. The shepherd might have shown kindness and understanding towards others, which could have resonated with the king's own values.

Conclusion:
In conclusion, the king was impressed by the shepherd's humbleness because it stood out as a positive and admirable quality in contrast to the expectations associated with someone in a position of power. The shepherd's modest and genuine nature likely caught the king's attention and earned his admiration.