"Severe" means very bad or very serious, so "serious" is the best match. "Calm" is the opposite, meaning free from disturbance, "excellent" means great or fantastic, "hail" is a weather phenomenon in which small lumps of ice fall from the sky, and "concern" is a feeling of sympathy.

"Ailing" means sick or hurt; it is an antonym of "healthy." So, "ill," which means sick, is the correct answer. None of the other answer choices are close in meaning to "ailing": "destitute" and "poor" are synonyms that both mean lacking money; they are both antonyms of "wealthy," which means having lots of money.

VITAL means significant or important.

"Little" means small, and since "miniature" is defined as small or smaller than a regular-sized version of something, "miniature" is the best answer choice! To help you determine the correct answer, take a look at the prefix of miniature, which is "mini-" meaning small. "Colossal" is also an antonym of "little."

“Rigorous” means very strict and difficult and comes from the word "rigor," meaning strictness or harshness. “Demanding” is similar in meaning, as a task that is demanding, such as a test, is usually very strict and difficult. To further help you, if someone is “unflinching” they are not scared; “belligerent” means hostile; “choleric” means angry or irritable.

“Feasible” means capable of being done, so something that is "feasible" is possible. To further help you, “malleable” means capable of being molded or formed. Notice how the suffixes -"ible" and ­"-able" both mean able to be done.

If you are “fatigued,” you are tired or exhausted. “Spent” can mean tired or exhausted, as in “I jogged for hours and feel spent.” Do not mistake “fatigued” for fat or large despite the beginning of the word. “Fatigued” comes from the French "fatigue," whilst "fat" comes from the German or Anglo-Saxon "fett." To further help you, “expanded” means made bigger; “reversed” means sent back in the opposite direction. 

Something that is "potent" is extremely efficient and powerful, so "powerful" is the correct answer. None of the other answer choices are close in meaning to "potent": "meaningful" means important or significant; "meaningless" means not important or not significant; "powerless" means not having the ability to change something or alter a situation; and "substantial" means significant.

Something that is "covert" is highly secretive, so "secretive" is the correct answer. As for the other answer choices, "dishonest" means not honest, and "trustworthy" means deserving of trust or responsible.

Since "eerie" is an adjective that means "strange and frightening," we need to find another word that also means "strange and frightening." While "frightened" might look like a good answer choice because someone might be frightened if they see something eerie, "frightened" cannot be the correct answer because it does not mean "strange and frightening." "Spooky," on the other hand, means "strange and frightening," so it is the correct answer.