"Frigid" means very chilly or cold. Therefore, the best synonym for "frigid" is "cold." While "snow" is cold, it is a noun, and does not mean the same thing as "frigid." "Different," "straight," and "solid" are each unrelated to the word "frigid." Therefore, "cold" is the best answer.

The word "rancid" originally comes from the Latin for "stinking." This is still reflected in the strict sense of the word, for "rancid" generally is used to describe food that has taken on a bad odor or taste because it is old. While this might mean that the food is merely stale, generally speaking, a bad taste only happens because of rotting or something of the like. Therefore, among the options provided, the best answer is "rotten," which most likely describes food that is rancid. Do not be tricked by the word "obnoxious." In a sense, something that is rancid is obnoxious, in that an obnoxious thing is unpleasant (as is something rancid). Still, "obnoxious" is very general in its meaning, whereas rancid applies to something food-related. Therefore, "rotten" is a better answer.

While all four of these answer choices are adjectives, only one shares its meaning with "raucous," which is often used to describe loud, discordant, overly rowdy situations or groups of people. Here, "noisy" is our best answer. "Silent" and "melodic," both of which also relate to sound, are near antonyms. Something that is "silent" makes no noise at all, while a "melodic" sound would be musical and pleasant, not harsh or unpleasantly loud. "Melancholy" describes a deeply sad or depressed mood and can therefore be eliminated, and "sharp" describes pointed ends or well-honed edges that can prick or split things.

A “fever” is a type of sickness or illness in which one feels very hot, tired, and physically weak. If one is "feverish," one is "hot."

Something that is "unkempt" is disorderly and disorganized in appearance. The word from the answer choices that most closely means this is "messy," which is therefore the correct answer.

"Shrouded" means cloaked or veiled. Thus, something that is "shrouded" is "covered," making "covered" the best synonym. While something that is "shrouded" may be "dark," those words are not the same in meaning. Therefore, "dark" is a tempting wrong answer choice. 

Have you ever been in a friend's house that seems almost too clean? Or walked by a lawn that was perfectly manicured? In situations like these, you could use the adjective "pristine," which means perfectly clean or untouched. The best choice for a synonym is clearly "spotless," which could also describe an impeccably clean environment. Both "dirty" and "marred" are antonyms, and "self-assured" simply describes a confident or assertive person.

The “aroma” of something is how it smells, so one could say that a flower has a nice aroma.

Something that is "fragrant" has a "fragrance," another word for a smell or an aroma. Therefore, "aromatic" is the correct answer, as both "fragrant" and "aromatic" mean nice-smelling.

"Dilapidated" means not maintained over time and therefore run-down and in poor condition, so "ramshackle," which means run-down, is the correct answers. None of the other answer choices is close in meaning to "dilapidated."