"Lucrative" is defined as moneymaking. This is simliar to "profitable."

"Monetary" means relating to money, or financial, so "financial" is the synonym.

The word "apt" means appropriate or very intelligent. The best choice is "appropriate," as it is a part of the definition of the word "apt." Considering the other options, an "application" is a request, "inappropriate" means not suitable, and "fit" means in good physical condition.

"Appropriate" means fitting, right, or suitable. To help you, "severe" and "intense" are synonyms of one another; they both describe something that is extreme. Also, "mediocre" means average when better-than-average was expected.

"Futile" is an adjective meaning "incapable of producing any useful result" or "pointless." So, we need to pick out an answer choice that is an adjective and means something like "pointless." While both "pointless" and "effortless" end with the suffix "-less," "effortless" means "requiring no physical or mental exertion" or "achieved with admirable ease," so it cannot be the correct answer because it does not mean "pointless." "Ineffective," however, means "not effective," as you might be able to guess from the combination of the negative prefix "in-" and the word "effective." Since "ineffective" is the answer choice closest in meaning to "futile," "ineffective" is the correct answer.

"Labyrinthine" is an adjective that means either "like a labyrinth; irregular and twisting" when describing a network, or "intricate and confusing" when describing a system. So, we need to pick out an answer choice that means something like "irregular and twisting" or "intricate and confusing." "Simple," then, cannot be the correct answer, because "simple" is an antonym of "labyrinthine," not a synonym. "Convoluted," however, is an adjective that means "extremely complex and difficult to follow" and is often used of an argument, story, or sentence. Because "convoluted" is the answer choice closest in meaning to "labyrinthine," "convoluted" is the correct answer.

"Potent" means powerful or strong, so "powerful" is the synonym. 

"Futile" means useless, meaningless, not going to be successful. To further help you, "dreaded" means feared; "despair" is a feeling of sorrow and hopelessness.

The word "facile" means easy, or usually, too easy. To provide further help, "soporific" means sleep-inducing, causing exhaustion; "energizing" means gives energy; "malicious" means spiteful, intending to cause harm. To provide further assistance, "soporific" and "energizing" are antonyms of one another, just like "facile" and "challenging" are antonyms of one another. Synonyms are two words that have the same meaning and antonyms are two words that have different meanings.

“Anemic” means weak or feeble. The prefix a- means not or without, as evidenced in “anemic,” which means without strength, or “atheist,” which means without religion, without belief. To provide further help, “robust” means strong and reliable; “eloquent” means well-spoken; “erudite” means intelligent and well-read.