When you are "apprehensive," you are fearful that something negative is going to happen. You have likely heard of the word "apprehend." (If you haven't, you should use it!) The word "apprehend" means to seize or grab. It is often used when we talk about the police "apprehending a criminal," that is, seizing and grasping a criminal. An "apprehensive" state of mind is one that is "grasped by fear" or "seized by worry." Therefore, the best answer is "anxious," for when someone is anxious, he or she is quite worried.

“Deflated” means saddened and discouraged by some experience. To provide further help, “encouraged” means supported; “disposed” means got rid of; “imposed” means forced upon; “implied” means suggested. 

"Intimidated" means scared, frightened, or overawed, so "scared" is the correct answer. None of the other answer choices are close in meaning to "intimidated": "dominant" means superior or most powerful; "stationary" means immobile or not moving; "hazardous" means unsafe or dangerous; and "chronological" means in an order based on when something occurred.

"Plaintive" is an adjective that means "sounding sad and mournful." So, we need to pick out an adjective that means something similar to "sad" or "mournful." So, "celebratory" cannot be the correct answer because it is an antonym of "sad" and "mournful." "Sorrowful," however, is an adjective that means either "feeling or showing grief" or "causing grief," and because it is the answer choice closest in meaning to "plaintive," "sorrowful" is the correct answer.

“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.