The word "tentative" means uncertain. The best choice is "unsettled," which also means uncertain. Considering the other choices, to "chide" means to express disapproval, "caustic" means judgemental, and "timely" means well-timed.

"Transient" is defined as lasting only for a short amount of time, making "temporary" the best answer choice. "Permanent," "long-term," and "lengthy" are all antonyms of transient. 

"Omniscient" means having complete and unlimited knowledge.  "All-knowing" means knowing everything, so it is the best match.

"Quizzical" means demonstrating that you do not understand something and have a question and usually refers to expressions. "Inquire," the verb form of "inquiring," means ask, so "inquiring" is the best match because it means demonstrating that you have a question about something.

For something to be "fanciful," it means that it is whimsical and imaginary; it is opposite of something that is real and reasonable.

You might use the word "obvious" every day, but the answer to this question might not be obvious at first sight! The word means not hidden or clear and understandable. The word "evident" means obvious or plainly expressed and understood. It is related to "evidence." "Evidence" is something that makes another thing to be known. For example, evidence in a criminal case is used to make the guilt or innocence of the charged person known. When something is "evident," it is obvious and can function well as evidence. Notice that every other answer (other than "interesting") is opposite in meaning to "obvious."

The word "implicit" means understood without being said. The best choice is "unspoken" because "without being said" is part of the definition of "implicit." 

When a person behaves rationally, he or she is thinking sensibly about his or her actions. Similarly, "logical" behavior is conducted according to reasonable thought or "logic." In other words, these two terms are synonyms. As for the other choices, "unreasonable" behavior is not sensible, an "irritated" person is bothered or annoyed, someone who is "hurried" is rushed, and something "frangible" is easily broken.

"Preposterous" means not making sense, ridiculous, or absurd, so "absurd" is the correct answer. To help you, "whimsical" means quirky and silly, "intelligent" means smart, "mediocre" means average when a higher quality is expected, and "available" means able to be used or gotten.

"Ephemeral" is an adjective that means "lasting for a very short time." So, we need to pick out an answer choice that means something like "lasting for a short time." "Permanent" cannot be the correct answer, then, because "permanent" is an antonym of "lasting for a short time." "Transitory," however, is an adjective that means "not permanent," or in other words, "of brief duration : temporary," and because it is the answer choice that is closest in meaning to "ephemeral," "transitory" is the correct answer.