Synonyms

Acute means sharp or crucial.

If something is "antiquated," it is old-fashioned or out of date.

The 200 year old house’s antiquated heating system still used coal as its fuel source.

So "outdated" is the best answer.

"Disarming" can mean charming, persuasive, or beguiling and often describes someone's smile or demeanor. "Unwitting," on the other hand, means unaware. Don't confuse "disarming" with weapons and choose "aggressive" or "hazardous." "Imminent" means forthcoming or impending.

"Ecumenical" and "catholic" both mean all-encompassing, universal. (Don't confuse catholic with "Catholic," a specific religious denomination.) "Germane" is an antonym for "irrelevant." "Exuberant" means overjoyed, while "tyrannical" means authoritarian and cruel.

The adjective "abominable" means horrible, gruesome, detestable and "loathsome." Additionally, "wizened" means weakened and wrinkled with age; "quixotic" means unrealistic, extremely impractical, based on romantic notions; "venerable" means deeply respected due to age and experience.

The adjective "esoteric" means understood by only a small number of people, arcane and privileged knowledge. The correct answer is therefore "arcane." Additionally, "ingenuous" means naive, easily misled by others; "truculent" means aggressive, quick to anger, eager to fight; "torpid" means inactive, sluggish, lacking energy; "pervasive" means spread throughout.

Sustained means continuous or ongoing.

"Absurd" means unreasonable or ridiculous. "Amiable" means friendly. "Shocked" means to be surprised. "Detached" means not connected or unconcerned. "Vague" means not clear or hard to understand.

The adjective "cognizant" means aware of. Additionally, "ominous" means suggesting something bad will happen, portentous, threatening; "deleterious" means causing harm, injurious.

"Glib"means speaking a lot but in an insincere and flippant way, so "flippant," meaning facetious and rude, is the correct answer.