“Derivative” is an adjective that can mean “imitative of the work of another person, and usually disapproved of for that reason” and is usually used of an artist or work of art when used in this way. So, we need to pick out an answer choice that means something like “imitative.” That means that “unique” cannot be the correct answer, because “unique” is an adjective that means “being the only one of its kind; unlike anything,” making it an antonym, not a synonym, of “derivative.” “Unoriginal,” however, is an adjective that means “lacking originality; derivative,” and because “unoriginal” is the answer choice closest in meaning to “derivative,” “unoriginal” is the correct answer.

“Replete” means having much of something or being full of something. Do not mistake it for “repeat,” which has the same meaning as “reiterate.” To clarify the other terms, “luminous” means producing or seeming to produce light; “wage” means to engage in or carry on; “sever” means to remove or separate.  

"Ample" means enough or sufficient.

"Additional" means extra.

If something is “devoid,” it is being without a usual or expected attribute or accompaniment, so a “devoid” landscape could mean that it is lacking trees or life. If something is “barren,” it has very few plants or is not suitable for plants,so it is similar in meaning to “devoid.” “Devoid” is related to the root word “void,” which means empty space.

“Piddling” means small or unimportant. “Lilliputian” also means small; it comes from the book Gulliver's Travels and began to be used in language in the early 1700s. To help you, the suffix “-ous” means characterized by. “Gauche” means unpolished, clumsy, or inelegant. “Humongous” means extremely large. “Fungous” means the same as fungal.

“Abysmal” is an adjective that means “extremely bad; appalling,” so we need to pick out an answer choice that means something like “extremely bad.” That means that “phenomenal” cannot be the correct answer, because “phenomenal” is an adjective that can mean “very remarkable; extraordinary,” making it an antonym, not a synonym, of “abysmal.” “Deplorable,” however, is an adjective that can mean “shockingly bad in quality,” and because “deplorable” is the answer choice closest in meaning to “abysmal,” “deplorable” is the correct answer.

Something that is “exquisite” is beautiful and perfect. For clarification, "pliable" means flexible, and "haughty" means proud or self-important.

"Banal" means trite, cliché, and unimaginative; as such, it is most similar in meaning to “unoriginal.”

"Decent" means satisfactory. "Insufficient" means lacking in quantity and "unreasonable" means not reasonable, as one can infer from the word being a combination of the negative prefix "un-," which means not, and "reasonable." As for the other answers, neither of them are close in meaning to "decent": "familial" means of or relating to family, and "insane," being a combination of the negative prefix "in-," which means not, and "sane," means not sane, or suffering from a severe mental illness.