The words are:
Nonplussed: unperturbed
Example: I wish the news were more surprising, but it’s not. I remain now, and forever, nonplussed.
Obsequious: obedient in a servile way
Example: You’re not a servant—why so obsequious?
Petulant: bad-tempered
Example: The petulant child continued to interrupt the other classmates when it was their turn to speak.
That's it for now. I just finished the book. Now onto the next one.