how was chillingworth injuring dimmesdale without inflicting any physical injury?

Was it mental torture? Did Dimmesdale suffer (mental) agony?

NO

To answer your question, Chillingworth was inflicting psychological and emotional torment on Dimmesdale, rather than physical injury. He pursued a path of deliberate psychological manipulation and observed Dimmesdale closely to exploit his weaknesses. This caused Dimmesdale to suffer mental anguish and inner torment.

If you'd like to explore how Chillingworth inflicted this torment in more detail, one way to understand it is by analyzing the events and actions described in Nathaniel Hawthorne's novel, "The Scarlet Letter."

Here are a few key points to consider:

1. Role as a physician: Chillingworth used his medical knowledge and access to Dimmesdale's physical condition to manipulate him. He became Dimmesdale's personal physician and the two lived together, allowing Chillingworth to closely observe and probe his patient's mental and emotional state.

2. Constant presence: Chillingworth ensured that he was always around Dimmesdale, watching him closely. This caused Dimmesdale to constantly feel scrutinized and prevented him from escaping the mental torment Chillingworth was inflicting.

3. Dark intentions: Chillingworth held a deep grudge against Dimmesdale, convinced that he was responsible for his wife's adultery, which led to her shame and death. His actions were driven by revenge, seeking to make Dimmesdale suffer for his sins.

4. Manipulative behavior: Chillingworth employed various manipulative tactics to further torment Dimmesdale. He would subtly question and prod him about his guilt, trying to elicit emotional reactions and fuel his inner turmoil. Chillingworth's words and actions were designed to undermine Dimmesdale's self-confidence and exacerbate his guilt.

5. Symbolic reminder: Chillingworth's physical appearance became increasingly grotesque and sinister over time, mirroring the decay of Dimmesdale's conscience. This served as a constant reminder to Dimmesdale of the guilt he carried and the torment Chillingworth inflicted upon him.

Overall, while Chillingworth did not physically harm Dimmesdale, his actions caused profound mental and emotional anguish, perpetuating Dimmesdale's internal suffering throughout the course of the story.