"Indefatigable" and "unflagging" are synonyms, both words mean relentless, tireless, persistent and tenacious. So, to solve this analogy you need to determine which of these words has the same meaning as "disingenuous." Well, "disingenuous" means not truthful, deceptive. So, the correct answer is "mendacious." Additionally, "truculent" means aggressive; "juvenile" means immature, youthful; "sincere" means open and honest, genuine; "debauched" means depraved, wicked, (of behavior) sinful.

"Contort" and "twist" are synonyms, both words mean to bend out of shape. So, to solve this analogy you need to determine which of these words has the same meaning as "encumber." Well, "encumber" means weigh down with, restrict the movement of. This is very similar in definition to "burden."

"Transient" and "ephemeral" are synonyms, both words mean fleeting, not eternal, lasting a short time. So, which of these words has the same meaning as "perspicacious?" Well, "perspicacious" means discerning, astute, able to understand and perceive things. This is the same definition as "shrewd." Additionally, "fraudulent" means inauthentic, not genuine, faked; "adulterated" means edited and made impure; "penitent" means feeling contrite and seeking forgiveness for; "extenuating" means (of circumstances) excusable. 

An "aeronaut" is a "pilot," someone who operates planes. So, which of these words is a synonym of "arena?" The correct answer is "amphitheater." An "amphitheater" is an arena for sporting events or artistic performances. Additionally, a "mutineer" is a renegade, a rebel; a "platitude" is an unoriginal or insincere comment; "innuendo" is a remark that is generally suggestive and involves word-play; a "libation" is a religious offering, typically of a liquid.

"Febrile" and "feverish" are synonyms, both words mean having a fever, being in a state of fevered excitement and nervousness. So, to solve this analogy you need to determine which of these words has the same meaning as "extraordinary" (incredible, unusual and remarkable). The correct answer is "ineffable," which means so "extraordinary" as to be impossible to describe. Additionally, "mundane" means ordinary and boring; "maudlin" means overly sentimental; "assiduous" means hard-working, showing great care and effort; "insidious" means treacherous, having a gradual, but negative, effect.

"Indelible" means unable to be removed, "permanent." So, to solve this analogy you need to determine which of these words has the same meaning as "manifest." Well, "manifest" means apparent, obvious, clear. So, the correct answer is "patent," which means obvious, easily understood as true. Additionally, "concealed" means hidden, disguised; "supreme" means best, greatest; "irresolute" means uncertain, unsure; "exigent" means urgent, pressing, demanding. 

"Catacomb" and "crypt" are synonyms, both words refer to an underground place where bodies are buried. So, to solve this analogy you need to determine which of these has the same meaning as "apostle." Well, an "apostle" is a follower of a religion, particularly one of the earliest followers of Jesus Christ. So, the correct answer is "disciple." Additionally, an "incumbent" is someone who's authority is being challenged and who already holds a position of power; a "heretic" is a nonbeliever, someone who goes against religious teaching or denies some religious truth; a "pugilist" is a fighter; a "mendicant" is a beggar.

"Aphorism" and "maxim" are synonyms, both words refer to a pithy statement that relays some kind of truth or lesson. So, to solve this analogy you need to determine which of these words has the same meaning as "iconoclast." Well, an "iconoclast" is someone who verbally attacks long-held beliefs. This is similar in definition to a "critic." Additionally, a "deity" is a God; a "heathen" is a heretic, a nonbeliever.

"Elephantine" and "gigantic" are synonyms, both words mean excessively large, very big. So, which of these words has the same meaning as "morbid?" Well, "morbid" means demonstrating an abnormal and unsettling fascination with death. This is very similar in definition to "macabre," which means disturbing due to a close association with death. Additionally, "devout" means pious, deeply religious; "natal" means of or related to birth; "austral" means of or related to the south; "tumultuous" means chaotic, confusing and disordered.

"Dugout" and "shelter" are synonyms, both words mean a building intended to provide protection in the event of a bombing or other such act of war. So, to solve this analogy you need to determine which of these has the same meaning as "lichen." Well, "lichen" is a very small, plant-like thing that grows on rocks and the sides of trees. This is also called a "moss." Additionally, a "quarry" is a place where stone or marble is mined; "fortitude" is strength and resilience, the ability to keep going in spite of setbacks; "temerity" is audacity, nerve, excessive arrogance and confidence especially in violation of the rules.