Someone who is "affable" is easy to talk with and pleasant to be around. "Genial" best conveys this sense (a likable pageant contestant might be named "Miss Congeniality"—a related word).

Derived from an old Italian word that described one's hair standing on end in horror, "capricious" means subject to sudden, unpredictable changes (a prospect that might terrify someone who desires a more-predictable life). This is best expressed by the adjective "erratic." Do not confuse "capricious" with "propitious" (favorable).

"Benign" and "benevolent" both mean kindly or favorable. "Unkempt" means shabby or sloppy. "Injurious" means hurtful or destructive. "Malignant" means diseased or cancerous. "Stygian" means dark or shadowy.

"Willful" and "obstinate" both mean stubborn or headstrong. "Abysmal" means to a great extent or immeasurable. "Noisome" means immoral, bad, or offensive. "Arboreal" means pertaining to trees. "Nonplussed" means confused.

"Quixotic" and "idealistic" both mean foolishly dreamy. "Cynical" means nonbelieving or doubtful. "Pragmatic" means sensible or efficient. "Demure" means reserved or affected. "Cogent" means effective or compelling. 

"Forbearing" and "tolerant" both mean forgiving or moderate. "Impotent" means disabled or unable to perform an action. "Garish" means flashy or tasteless. "Intrepid" means brave or nervy. "Stolid" means apathetic or stupid. 

"Garrulous" means talkative, so "talkative" is the correct answer. None of the other answer choices are close in meaning to "garrulous": "bizarre" means strange or very odd "Cocnsiderate" means thoughtful or considering the feelings and thoughts of other people; "pleasurable" means giving one pleasure; and "imminent" means impending or close to occurring.

"Dour" is an adjective that refers to someone's manner or appearance and has a few different meanings, including gloomy and austere. While "dilapidated" sounds like it might be a good answer choice, it means in poor condition due to having been neglected over time—not quite what we're looking for. "Grim," on the other hand, can mean somber or gloomy and is the closest in meaning to "dour," so it is the best answer choice.

The word “prudent” has perhaps received a bad sense in its standard usage by most English-speakers. One will at times speak of “prudent” people who know how to work things to their gain. For instance, someone might be called “prudent” for keeping silent about opinions instead of insulting someone who might give him or her a job; however, the word “prudent” is of much nobler origins, meaning discerning or even wise in practical action. For this reason, among the options provided, the best option is “judicious,” meaning judging well. This meaning will cover the more negative uses but likewise applies to the nobler notions of “prudence.”

"Capricious" means changing one's mood in a fickle, unpredictable manner, so the answer choice that is its best synonym is "fickle," or changing frequently.