Privy means to be in on or sharing some secret knowledge, or informed.

The word “spurious” most generally means false or fake, often implying that the fake thing does not at first appear to be fake, though it really is. Often, one will find the word used to describe a “spurious argument” or a “spurious claim,” meaning arguments and claims that are ultimately false.

"Demonstrative" is an adjective that can mean openly demonstrating feelings or providing conclusive proof. We need to pick out an adjective that means something like showing feelings or providing proof. "Inconclusive" cannot be the correct answer because it is an antonym of the second meaning of "demonstrative," providing conclusive proof. "Indisputable," however, is an adjective that means unable to be disputed and because it is the answer choice closest in meaning to "demonstrative," "indisputable" is the correct answer.

Affected means artificial or pretentious.

When used as an adjective, the word “dubious” means “doubting” or “hesitating.” It is clearly related to “dubious” as well as the word “indubitable,” which means “unable to be doubted.” It would be used in a sentence like, “Since the argument presented to him was rather weak, John remained rather dubious regarding the truth of its conclusions.” Among the options provided, “uncertain” is the closest to this sense.

"Candid" means impartial, open, or honest. "Caustic" means burning or sarcastic. "Corporal" means bodily or physical. "Prevalent" means accepted or widespread. "Ubiquitous" means ever-present or pervasive. 

"Cognitive" and "logical" both mean reasonable or rational. "Irrational" means illogical or senseless. "Eclectic" means comprehensive or diverse. "Irascible" means crabby or cantankerous. "Voluble" means talkative or chatty. 

"Veritable" and "bona fide" both mean authentic or actual. "Voracious" means very hungry or greedy. "Ironic" means sarcastic or caustic. "Raucous" means rowdy or rough. "Effusive" means gushing or profuse. 

"Unwitting" is an adjective that means either "not aware of the full facts" when referring to a person, or "not done on purpose; unintentional." So, we need to pick out an adjective that means something like "not aware of the full facts" or "unintentional." "Purposeful" cannot be the correct answer, then, because "purposeful" is an antonym of "unwitting," not a synonym. "Inadvertent," however, is an adjective that means "not resulting from or achieved through deliberate planning," and because it is the answer choir that is closest in meaning to "unwitting," "inadvertent" is the correct answer.

Although one can be said to “verbalize” his or her words when he or she writes them, the term most often is used to describe the process of speaking ideas that were heretofore unspoken. For example, you could say, “After thinking about his theory for a number of years, Paul finally decided to verbalize it, hoping that he could clarify his thoughts by speaking them.”