"Somber" is an adjective meaning dull, depressing, and/or dark, so the answer closest in meaning to "somber" is "sad," which is an adjective meaning unhappy and sorrowful. Considering the other answer choices, none are close in meaning to "somber": "happy" means pleased and glad; "tired" means somewhat exhausted; and "irritated" means annoyed.

If something is sullen, it means it is gloomy.  For instance, teenagers are quite sullen and moody to the dismay of their parents.

"Crestfallen" is an adjective that means downhearted, so we need to pick out an answer choice that means something like sad. "Cheerful" cannot be the correct answer, then, because "cheerful" means happy, so it is an antonym of sad. "Dejected," however, is an adjective that means sad, and because it is the answer choice that is closest in meaning to "crestfallen," "dejected" is the correct answer.

"Energetic" means lively or exuberant, so "exuberant" is the correct answer. None of the other answer choices are close in meaning to "energetic": "concise" means short and to the point; "timid" means fearful or easily scared; "diligent" means industrious or hard-working; and "courageous" means brave and bold.

"Poignant" means evoking a keen emotion. Therefore, something that is "poignant" is "memorable," as it has the ability to evoke keen emotions. "Pointed" means sharp or filed and is not a synonym of "poignant." "Distorted" means warped, which is also not a synonym of "poignant." While something that is "hurtful" might have the potential to be "poignant," the words are not synonyms because they do no mean the same thing. "Poignant" refers to evoking emotions, while something that is "hurtful" alludes to physical or emotional pain.

"Apprehensive" means anxious or worried about something, so "anxious" is the correct answer. None of the other answer choices are close in meaning to "apprehensive": "pacific" means peaceful and non-violent; "stubborn" means unwilling to change's one mind despite contrary evidence; "immaculate" means extremely clean; and "dutiful" means responsible and willing to fulfill one's duties and tasks.

"Turbulent" is an adjective that can mean either "characterized by conflict, disorder, or confusion; not controlled or calm," or when speaking of air or water, "moving unsteadily or violently." So, we need to pick out an answer choice that means something like "characterized by disorder" or "moving violently." "Orderly," then, cannot be the correct answer, because "orderly," which means "neatly and methodically arranged" or "of a person or group: well behaved; disciplined," is an antonym of "turbulent," not a synonym. "Tumultuous," however, is an adjective that means either "making a loud, confused noise; uproarious," or "excited, confused, or disorderly." Because "tumultuous" is the answer choice closest in meaning to "turbulent," "tumultuous" is the correct answer.

"Jubilant" means very happy and is related to the words "joy" and "jubilation," which both mean happiness, and "jubilee," which means anniversary.

The word "melancholic" means saddened or depressed. The best choice is "saddened" because it is a part of the definition of "melancholy." Considering the other choices, "harmonious" means peaceful, "contrary" means opposite, and "persistent" means tenacious or lasting.

An "ebullient" individual is wildly energetic or enthusiastic about something. Since "exuberance" is a word that means great excitement and eagerness to do something, "exuberant" is our synonym in this case. "Common," which is synonymous with ordinary, and "lethargic," which means tired or apathetic, are incorrect choices. "Pallid" means pale and is usually used to describe someone's appearance; for example, you likely appeared pallid the last time you were sick.