His face darkened with some powerful emotion, which, nevertheless, he so instantaneously controlled by an effort of his will, that, save at a single moment, its expression might have passed for calmness. After a brief space, the convulsion grew almost imperceptible, and finally subsided into the depths of his nature. What does this characterization reveal about Chillingworth?

3rd person, because the narrator is out of the story but explains the feeling of the main character

the answer is

#1  sara was always tasked with selecting birthday presents for her friends and family because everyone admired her  impeccable taste. 

impeccable (adj): perfect, flawless

#2  they moved to the united states many years ago, but their  insular  attitudes made it difficult for them to socialize. 

insular (adj): isolated; separate

#3  the professor explained the  semantic  relationship between the two nouns used in the sentence. 

semantic (adj): related to words or the meanings of words 

happy to : )