“Reluctant” means not willing, so "unwilling" is the correct answer. None of the other answer choices are close in meaning to "reluctant": “cantankerous” means grumpy; “enthused” means excited; “demonic” means marked by qualities of the devil or of demons; “susceptible” means vulnerable or in danger from something specific.

The word "hostile" means not friendly or like an enemy. The best choice is "hateful," which means expressing hate or dislike of something. Considering the other choices, "complicated" means difficult to understand, "courteous" means polite, and "lively" means energetic.

The word "cantankerous" means hard to deal with or ill-tempered. The best choice is "grouchy," which shares the same definition.

"Suspicious" means to be "unsure" or uncertain that someone or something is what that person or thing appears or claims to be. This differs from "unsatisfied," which means not content; "reliable," which means responsible; "precise," which means exact; and "definite," which means certain.

"Aggravating" means exasperating. Similarly, "frustrating" means bothersome or annoying. These words are very similar, and therefore are synonyms.

To be "disgruntled" means to be dissatisfied and unhappy. To be "upset" means to be in a state of dismay. Given how similar in meaning "disgruntled" and "upset" are, "upset" is the correct answer.

If you are “furious,” you are very angry. Something that is “humorous” is very funny. If you are “jealous,” it means you want something that someone else has.

"Surly" means sullen, uncivil, and unsmiling, so "sulky," an adjective that means brooding, petulant, and in a bad mood, is the correct answer. If you confused "surly" with "burly" (physically strong and stocky) you may have picked "brawny" (physically strong and muscular) as your answer. "Contemporary," when used as an adjective, means existing at the same time as something else in the past or having to do with the modern day. "Furious" means very angry and "important" means deserving of attention or pressing.

If someone is nonchalant about a test grade, it means he or she is unconcerned or aloof.  Nonchalant is defined as laid back or not easily excited.

Two of the wrong options attempt to have you confuse "elated" with "related." (These wrong options are "connected" and "associated".) To be "elated", however, is to be very happy. The word "ecstatic" means just this as well. It actually comes from root words meaning standing outside. Have you ever heard someone say, "She was beside herself with joy!" This means the person was almost "outside" herself because of her strong feelings. To be "ecstatic" is to be very happy in this way.