"Tactful" means polite, so "polite" is the correct answer.

“Open-minded” is an adjective that means open to considering new ideas. That means that “intolerant” cannot be the correct answer, because “intolerant” means not tolerant of ideas or beliefs different from one's own, making it an antonym, not a synonym, of “open-minded.” “Flexible,” however, is an adjective that can mean adaptable to new ideas and circumstances when describing a person, and because “flexible” is the answer choice closest in meaning to “open-minded,” “flexible” is the correct answer.

"Persistent" is an adjective that describes someone or something that is determined and tenacious. Of the answer choices, "dogged," which means resolute, has the closest meaning.

"Winsome" means charming or engaging.

“Capricious” is an adjective that means “given to sudden changes,” so we need to pick out an answer choice that means something like “given to sudden changes.” That means that “consistent” cannot be the correct answer, because “consistent” means “unchanging in achievement” when referring to a person, behavior, or process, making it an antonym, not a synonym, of “capricious.” “Mercurial,” however, is an adjective that can mean “subject to sudden or unpredictable changes of mood” when describing a person. So, because “mercurial” is the answer choice closest in meaning to “capricious,” “mercurial” is the correct answer.

“Plucky” is an adjective that means “having or showing determined courage in the face of difficulties,” so we need to pick out an answer choice that means something like “courageous.” That means that “afraid” cannot be the correct answer, because “afraid” means “feeling fear or anxiety; frightened,” making it an antonym, not a synonym, of “plucky.” “Intrepid,” however, is an adjective that means “fearless; adventurous,” and because “intrepid” is the answer choice closest in meaning to “plucky,” “intrepid” is the correct answer.

"Lofty" can mean either very high or exalted; however, in this instance it is used to mean haughty which is most similar in meaning to "proud." Answering this question relies on your knowledge of more than one definition of lofty. Remember it is important to always be aware of the secondary and tertiary meanings of words. For clarification, "gregarious" means outgoing; "ostentatious" and "extravagant" are synonyms that both describe something showy and luxurious.

"Vicious" means brutal or "violent." "Helpful" means a person who assists others or is supportive. "Cooperative" means able to work well with others. "Obedient" means compliant or willing to follow the orders or others. "Stubborn" means not willing to change one's viewpoint or course of action.

Someone who is "intrepid" is very enterprising and adventurous. For clarification, "timid" means shy and reserved; "ingrained" is something embedded or inbuilt; "susceptible" means vulnerable.

"Congenial" means agreeable or friendly, so "agreeable," which means pleasant or amenable to something, is the correct answer. For clarification, "avaricious" means greedy, "portentous" means self-important or ominous, "generous" means liberal in giving, and "disagreeable" means not agreeable or unpleasant, as one might be able to infer from the word being a combination of the negative prefix "dis-" and the word "agreeable."