Something that is “murky” is dismal and dark, so "dark" is the correct answer. So, water might be “murky” if it were very dirty. “Murky” is also the opposite of “clear,” which means transparent and unclouded. “Sore” means in pain due to overexertion of muscles; “intentional” means done on purpose; and “mighty” means strong.

"Hardy" is an adjective that means "robust; capable of enduring difficult conditions," or when used of a plant, "able to survive outside during winter." One might assume that "firm" is the best answer because "hardy" contains the word "hard," but "hardy" does not mean the same thing as "hard," so "firm" cannot be the correct answer. One meaning of "rugged," however, is " having or requiring toughness and determination." Because "rugged" is the answer choice closest in meaning to "hardy," "rugged" is the correct answer.

"Stout" means fat.

The word "blunt" means not sharp. "Dull" is the best choice because it also means not sharp. Considering the other choices, "acute" means sharp, "tepid" means lukewarm, and "significant" means important.

"Fragile" means easy to damage or break. "Delicate" is the word choice that most closely matches this definition. "Sturdy," which is a synonym of strong, is the opposite of "fragile," and "dangerous" and "pure" are both unrelated words.

"Corrugated" is an adjective that refers to a material, surface, or structure and means "shaped into alternate ridges and grooves." So, "flat" cannot be the correct answer because it is an antonym, not a synonym, of "corrugated." "Grooved," however, is an adjective that means "provided with or having a groove or grooves," and because it is the answer choice closest in meaning to "corrugated," it is the correct answer.

"Durable" is an adjective that means "able to withstand wear, pressure, or damage; hard-wearing," so we need to pick out an answer choice that means something like "able to withstand wear." "Fragile" cannot be the correct answer, then, because "fragile" means the opposite of "durable," so it is an antonym, not a synonym, of "durable." "Hardy," however, is an adjective that means "robust; capable of enduring difficult conditions" and because "hardy" is the answer choice closest in meaning to "durable," "hardy" is the correct answer.

"Firm" means hard.

"Vacant" means empty. "Empty" is the best choice because it is a part of the definiton for "vacant." Considering the other choices, "lively" means energetic, "absent" means away or missing, and "evacuate" means to leave an area because it is dangerous. "Evacuate" is not as good a choice because it is a verb, while "vacant" is an adjective.

The word "permeable" means full of small holes that let liquids and objects of a certain size pass through. The best answer choice is "porous," which means full of small holes that allow air or liquids to pass through. Considering the other choices, a "sponge" is something that is permeable, "permanent" means lasting forever and unchanging, and "changing" is an antonym of permanent.