“Gruesome” means unpleasant, horrific, or disgusting, so "horrific," which means horrifying and shocking, is the correct answer. To provide further help, "pleasant" means friendly or enjoyable; "mysterious" means not fully understood and difficult to understand; "controlling" means attempting to take charge of situations one has not been put in charge of; and "unruly" means badly behaved and not following rules or directions.

"Plain" is an adjective that means "not decorated or elaborate; simple or ordinary in character." So, we need to pick out an adjective that means something like "simple" or "ordinary." "Ornate," then, cannot be the correct answer, because "ornate" means "made in an intricate shape or decorated with complex patterns," making it an antonym, not a synonym, of "plain." "Unadorned," however, is an adjective that means "not adorned; plain," and because "unadorned" is the answer choice closest in meaning to "plain," "unadorned" is the correct answer.

Gentle and soft both relate to ones having a mild or kind nature.  They also can relate to being careful with ones touch. 

Active and moving both relate to being in motion. 

"Drastic" is an adjective that means "severe or serious," so we need to pick out another adjective that means "severe or serious." While "moderate" also has to do with degrees of seriousness, "moderate" means "not serious." Because "moderate" means the opposite of "drastic," it can't be the right answer. "Extreme," on the other hand, means "very serious or severe," and because it is the answer choice closest in meaning to "drastic," it is the correct answer.

The word "complex," when used as an adjective, means "having parts that connect or go together in complicated ways," or "not easy to understand or explain: not simple." So, we need to pick out an answer choice that means something like "having many connected parts" or "not simple." Since "intricate" means "having many parts" or "very complicated or detailed," "intricate" is the answer choice closest in meaning to "complex," so "intricate" is the correct answer.

"Ravenous" is an adjective that means "extremely hungry," so we need to pick out an answer choice that also means "extremely hungry." While "raven-like" might look like the correct answer because "ravenous" contains the word "raven," the meaning of "ravenous" doesn't have to do with ravens, so "raven-like" can't be the correct answer. "Famished," however, means "extremely hungry," so it is the correct answer.

"Precise" is an adjective meaning "marked by exactness and accuracy of expression or detail," or "exact, accurate, and careful about details" when referring to people, or "used to emphasize that one is referring to an exact and particular thing" (such as in "at that precise location"). So, we need to pick out an answer choice that means something like "exact," or is used to indicate particular things. Since "exact" is a synonym of "precise," "exact" is the correct answer.

"Treacherous" is an adjective with two different meanings: "guilty of or involving betrayal or deception," or "hazardous because of presenting hidden or unpredictable dangers," which is used to describe things like ground, water, or conditions. So, we need to pick out an answer choice that means something like "hazardous." Since "dangerous" means the same thing as "hazardous," "dangerous" is the answer choice closest in meaning to "treacherous" and the correct answer.

"Extraneous" is an adjective meaning "irrelevant or unrelated to the subject being dealt with," "of external origin," or "separate from the object to which it is attached." Since "unrelated" is the answer choice closest in meaning to "extraneous," "unrelated" is the correct answer.