"Flighty" is an adjective that means "fickle and irresponsible," so we need to pick out a word that means something like "fickle" or "irresponsible." "Dependable," then, cannot be the correct answer, because "dependable" means "trustworthy and reliable," making it an antonym, not a synonym, of "flighty." "Inconstant," however, is an adjective that means either "frequently changing; variable or irregular," or when referring to a person or their behavior, "not faithful and dependable." Because "inconstant" is the answer choice closest in meaning to "flighty," "inconstant" is the correct answer.

The word "fiend" comes originally from the word for a demon or a devil. We generally use it, however, to describe any kind of villain. It is in this sense that it is being used in this question. Such a villain need not be a wicked person in a story. We sometimes use the word also when we describe someone who abuses his or her fellow human beings, as when we say, "Thomas was nothing more than a fiend, given how he stole from all of the elderly in his neighborhood."

"Nonchalant" is an adjective that refers to a person or manner and means "feeling or appearing casually calm and relaxed; not displaying anxiety, interest, or enthusiasm." So, we need to pick out an answer choice that means something like "not worried" or "not interested." While "irresponsible" may look like a potentially correct answer choice simply because both "nonchalant" and "irresponsible" begin with negative prefixes, "irresponsible" means "not responsible" and is not similar in meaning to "nonchalant," so it cannot be the correct answer. "Unconcerned," however, means "showing a lack of worry or interest, especially when this is surprising or callous." Because "unconcerned" is the answer choice closest in meaning to "nonchalant," "unconcerned" is the correct answer.

A "sage" is someone with a high level of wisdom or, in its adjectival form, "sage" means learned. Therefore, the best answer choice is "wise," since it is the direct definition of "sage." In terms of the other answer choices, "candid" means honest, "affable" means kindly, "altruistic" means willing to give generously, and someone who is "innocent" is naive in certain aspects of life.

"Labor" means work, so it makes sense that “laborious” means involving hard work, or "difficult." “Mundane” means boring or ordinary; “mediocre” means average when higher quality was expected; and "overt" means obvious or easy to notice.

The prefix "inter-" should help you to figure out this word's meaning, even if you do not know it otherwise. This prefix means between. When you go to a theatre show, there is "intermission." This is the break that is between the main acts. This prefix should not be confused with "intra-," which means within. Now, "interspersed" means scattered between. When something is sparse, it is scattered. Thus, the "-spersed" portion of the word means scattered. When you intersperse something among other things, you mix it into them. Thus, the best option for this question is "mix."

Something that is "brisk" is best summarized as quick or fast; for example, a "brisk" wind is one that is blustering. In terms of the other answer choices, "forlorn" means lonely; "steady" means constant; "leisurely" means laidback; and "fierce" means strong or aggressive.

Because of the obvious root home, it is easy to think that "homely" means warm and welcoming (like "homey"). Be careful not to make this common mistake—"homely" does derive from "home," but it has traveled from there through the sense of plain and unadorned to our modern meaning of plain and unattractive. Be careful also not to confuse "homely" with "homily," which means a sermon.

"Unruly" is an adjective that means "disorderly and disruptive and not amenable to discipline or control." So, we need to pick out an answer choice that means something like "disruptive." "Well-behaved" cannot be the correct answer, then, because "well-behaved" is an antonym of "disruptive." "Rowdy," however, is an adjective that means "noisy and disorderly," and because "rowdy" is the answer choice closest in meaning to "unruly," "rowdy" is the correct answer.

The word "demonstrative" means serving the purpose of showing and explaining. The best choice is "show" as it is a part of the definition of "demonstrative."