The word "spacious" does have to do with space—physically open space, that is. When a room is "spacious" it has a lot of room in it. Thus, the word "roomy" is just fine as a synonym. Don't be tricked by the options that try to get you to pick something that deals with "outer space." We call it "space" because of all the empty room outside of planets and stars. (Hence, we can say, "Outer space is spacious," but "spacious" does not have anything to do directly with stars and other things like that.)

All of the options given here are about different kinds of "pieces" that we can have of something. A "chunk" of something, however, is a decent sized block. It is neither a sliver nor a mere "section." A chunk of cheese would be a little block of cheese, broken off the larger piece of cheese.

Whenever something is "enormous," it is very big. This "very" is important. Several options, like "big" and "large," do not express this "very." Only "huge" is a word that means very big. Therefore, it is the best option among those provided.

Something that is monotonous repeats without varying, so another word for "monotonous" is "repetitive." Considering the other choices, "loud" means great in volume, "monochrome" means consisting of one color or different shades of one color, and "same" means alike.

The correct answer is "speedy," or in a quick manner, as "swift" means occurring or moving very quickly. "Slow" is an opposite of "swift" and "dance" is not related in meaning to "swift" at all. While to "run" does mean to move quickly, "run" is a verb and "swift" is an adjective, so their meanings are very different.

The word "sluggish" means slow or lazy. "Slow" is the best choice, as it is a part of the definition of "sluggish." Considering the other choices, "stiff" means rigid. While it may seem related, the word "sluggish" describes some sort of motion, though very little, while "stiff" does not. "Active" is an antonym of the word "sluggish." "Slug" is only related because sluggish means slug-like, as in as slow as a slug.

"Nimble" means quick and agile. "Agile" is the best choice because it means easily able to move quickly and is part of the definition of "nimble." Considering the other choices, "robotic" means acting in an unchanging and unemotional manner, like a robot, "correct" means right or true, and "indifferent" means not caring. 

"Idle" means unmoving or not active. "Stationary" is the best choice because it also means unmoving. Considering the other choices, "hidden" means not in plain sight, "deter" means restrain from doing, and "vex" means anger or annoy.

"Regular" is an adjective that means occurring at even intervals, frequent, or usual. So, the answer choice closest in meaning to "regular" is "usual," an adjective that means typically occurring. None of the other answers are close in meaning to "regular": "atypical" is an antonym of "regular" and means not typical; "regulated" means controlled; and "trite" means unoriginal.

“Sluggish” means tired, lethargic and lacking energy.