'....Why is your spirit so vexed that you eat no food?
The addressee was sad because
The addressee, who is King Ahab, was sad because Naboth had refused to sell him his vineyard. In the passage, King Ahab was lying on his bed, with his face turned away, refusing to eat. When his wife Jezebel came to him and asked him why he was so sad, he told her about Naboth's refusal to sell him the vineyard. This led to Jezebel devising a plot to have Naboth killed so that the king could take possession of the vineyard. Therefore, the reason for King Ahab's sadness was due to his desire to acquire Naboth's vineyard and his disappointment over Naboth's refusal to sell it to him.