Final answer:
Felix, Agatha, and De Lacy were unhappy for different reasons, according to the monster in 'Frankenstein'. Felix was deceived by the monster, Agatha was exiled from her homeland, and De Lacy was disappointed in his family's actions.
Step-by-step explanation:
The monster in the novel 'Frankenstein' explains that Felix, Agatha, and De Lacy were unhappy for different reasons. According to the monster, Felix and his family were unhappy because they were deceived by him.
The monster had been secretly observing the family, learning their language and customs, and he had hoped to befriend them. However, when Felix saw the monster, he reacted with horror and disgust, which made the monster feel rejected and unhappy. Agatha, Felix's sister, was unhappy because she was exiled from her homeland.
The monster learns from his observations that Agatha used to sing while playing the harp with her father, and the monster enjoys listening to her music. Finally, De Lacy, the elderly father of Felix and Agatha, is unhappy because he is disappointed in his family's actions.
When Felix brings Safie, a Turkish woman, to their cottage, De Lacy is upset because he believes that her arrival will disrupt their peaceful and simple life.