"Impervious" means not able to be penetrated, so "impenetrable," which also means unable to be penetrated, is the correct answer. "Porous" is an antonym of "impervious"; it means having holes through which things can pass. None of the other answer choices are related in meaning to "impervious": "conceited" means self-centered or full of oneself; "incessant" means continual or without pause or break; and "delectable" means tasty or delicious.

"Shiny" is an adjective that means bright or glossy in appearance. "Glossy" is therefore the best choice, since it is a part of the definition of "shiny." Considering the other choices, "dull" is an antonym of "shiny" that means lacking polish or color, "alluring" means very attractive, "abhorrent" means detestable, and "persistent" means dogged and resolute when referring to a person lasting for a long time when referring to things.

“Noxious” means toxic or "poisonous." “Innocuous” means harmless; “hospitable” means welcoming; "habitable" refers to areas and means able to support life; and "fragrant" means having a pleasant smell.

“Odious” means disgusting, repulsive, or "repellent." As for the other answer choices, “endearing” means causing others to feel affection for one in one's interactions with them; “attractive” means good-looking; “coherent” means able to be understood and making sense; and “meddlesome” means interfering or getting in the way.

“Opulent” means luxurious, extravagant and very fancy, or financially rich. As for the other answer choices, “foreboding” means ominous; “disconcerting” means troubling or worrying; “penitent” means showing regret and wanting forgiveness; “indiscriminate” means done at random, aimless, and arbitrary.

“Austere” means severe and grim, so "dour," which means stern and solemn, is the correct answer. As for the other answer choices, “dire” means serious or terrible; “livid” means furious; “loyal” means faithful to a person, group, or cause; and “lucid” means clear and understandable.

“Incongruous” means out of place or "inappropriate." As for the other answer choices, “apt” means appropriate and right and is an antonym of "incongruous." “Discontinuous” means intermittent and containing gaps; “self-serving” means doing something to benefit only oneself; and “winsome” means charming.

Several of the proposed answers attempt to get you to confuse "furtive" with "fervent." The latter word means passionate and fierce. The word "furtive" actually comes from the Latin word for "thief". A thief acts under the cover of darkness and behaves secretively. Thus, when something is "furtive" it is secret or hidden. Therefore, the best option among those provided is "hidden."

The word "dismal" describes someone or something that is depressing, downcast, or gloomy. It can also describe something that appears dreary or gloomy—as when we say on a rainy day, "This is certainly some dismal weather!" Thus, the only appropriate option among those given is "dreary."

Often, we immediately associate the word "blaring" with an instrument like the trumpet. A "blaring trumpet" is one that is very loud. The word "blaring" does in fact mean very loud. Among the options provided, only one is related to sound in this way, namely "strident." This word can be used to describe someone who argues his or her position in a rather obnoxious way; however, its primary meaning describes something that is loud and harsh sounding as is the case with something that is blaring.