The word “staunch” has two meanings. One of them is “faithful” or “devoted.” This is the sense that is found here among the options provided. You might often hear the expression “staunch supporter.” Such a person is not an occasional supporter but instead is one that stands with whatever the cause / person is “come thick or thin.” The word can also mean “to stop the blood coming from a wound.”

Typically, someone who is hostile and aggressive is characterized as belligerent.

"Irascible" means cantankerous or crabby. "Tenacious" means strong-willed or determined. "Wary" means careful or cautious. "Opaque" means clouded, muddy, or hard to understand. "Mirthful" means merry or playful. 

"Saccharine" means something cloying or sickeningly sweet. "Munificent" means generous or giving. "Abashed" means confused or embarassed. "Mundane" means ordinary or humdrum. "Frigid" means frozen or exceptionally cold.

You might confuse “prodigal” with “prodigy” or “prodigious.” The former means “being very talented,” especially when that person is very young. For instance, one can speak of Mozart as being a “child prodigy,” having shown great musical talent from his youth. Something “prodigious” is impressive and of great magnitude. When something is “prodigal,” it is “great” in the sense of being wasteful. The Biblical story about the “Prodigal Son” is about a son who spends all of his money wastefully before coming home to seek forgiveness. He is called “prodigal” because of this wastefulness.

"Sagacious" and "astute" both mean smart or judicious. "Arrogant" means haughty or overly proud. "Barefaced" means shameless or open. "Complaisant" means agreeable or easy-going. "Effluent" means drainage or outflow. 

“Imperious” means overbearing, domineering, and assertive, so "overbearing" is the correct answer.  “Underneath” means under or beneath; “detached” means not connected to when describing physical objects and dispassionate when describing people; “abashed” means embarrassed; and "military" means having to do with a country's official armed forces.

Because "deft" means "neatly skillful and quick in one's movements," we're looking for a word that means "skillful" and specifically has to do with physical movement. While "wily" does involve skill, it does not refer to physical skill, but instead means "skilled at gaining an advantage, especially deceitfully." Dextrous, on the other hand, means "demonstrating neat skill, especially with one's hands," and is the closest synonym to "deft" of the listed answer choices.

“Meticulous” means very careful and diligent, especially with a particular project, so "diligent" is the correct answer. As for the other answer choices, “impolite” means rude; “extinct” means no longer in existence due to having died out entirely; "sly" means sneaky and full of guile; and "hazardous" means dangerous or having the potential to cause someone harm.

“Obdurate” means stubborn, intransigent, and not likely to change one’s mind, so "stubborn" is the correct answer. “Enlightened” means having a rational perspective and open-minded; "considerate" means thinking of other people's feelings when making decisions; “discerning" means perceptive and astute; “resolute” means determined, unwavering, sticking to something.