"Blunt" means expressing things clearly and honestly, which is also the definition of “straightforward.” So, "straightforward" is the correct answer. None of the other answer choices are close in meaning to "blunt": "stubborn" means not changing one's mind or plan even when urged to; "calculating" means cunning; "sympathetic" means thinking about other people’s feelings, and "silent" means making no noise.

“Authentic” means real or genuine. To provide further help, “phony” means the same thing as “fake," and “unsuccessful” means not completed or failed.

“Straightforward” can mean honest when used to describe a person, or simple and easily accomplished when used to describe a task. To provide further help, “deceitful” means dishonest; “comely” means cute; “savage” means wild and vicious; and “furious” means very angry.

“Legitimate” is a word that can be used as an adjective or as a verb, but because all of the answer choices are adjectives, that means that we will need to consider “legitimate” as an adjective. When used as an adjective, “legitimate” can mean “conforming to the law or to rules” or “able to be defended with logic or justification,” so we need to pick out an answer choice that means something like “legal,” “logical,” or “justifiable.” That means that “doubtful” cannot be the correct answer, because “doubtful” is an adjective that can mean “not established as genuine or acceptable,” making it an antonym, not a synonym, of “legitimate.” “Valid,” however, is adjective that can mean “having a sound basis in logic or fact; reasonable or cogent,” when used of an argument or a point, or “legally and officially acceptable.” “Valid” is the answer choice closest in meaning to “legitimate,” so “valid” is the correct answer.

Aimless means pointless or without a purpose; you might be able to infer this because the word is a combination of "aim," which can mean purpose or goal, and the suffix "-less," which means without. So, "pointless" is the correct answer becuase it means without a point or purpose. None of the other answer choices are close in meaning to "aimless": "meaningful "means important; "hopeful" means optimistic, and "helpless" means pitiful or incapable of defending oneself.

"False" and "unfounded" are synonyms. "Unfounded" refers to a claim that is not based in truth. The other words do not share this meaning.

The words "unreal" and "imaginary" are synonymous. They refer to things that do not have a physical reality. The word "unholy" refers to something that does not accord with religious beliefs. "Unclear" refers to something that is confusing; "useless" refers to something that has no use. "Underground" refers to something that is under the ground, like a basement.

The word closest in meaning to ACCURATE is "correct." "Accurate" means correct or exact.

"Decisive" means making decisions quickly.

If you have a "partial" answer or a "partial" payment, you only have part of it. "Partial" means incomplete.

"Developed" means advanced, or elaborated upon.

"Similar" means alike. Words that are synonyms are "similar."

"Ambiguous" most nearly means unclear or vague. It can also refer to a word or phrasing that has more than one meaning. "Finite," "definitive," and "standardized" all refer to something that is constant and in its final state and are therefore antonyms. "Manageable" refers to something that can be controlled and is not related to "ambiguous."

“Exotic” means coming from a distant place, so it is most similar in meaning to “foreign,” which means from a different country. To provide further help, “federal” means associated with a country's central government; “minimal” means of the least amount or an extremely small amount; “correct” means true and accurate; and “global” means something that is everywhere in the world.