Someone who is "sluggish" is lazy and slow, so "lazy" is the correct answer. None of the other answer choices are close in meaning to "sluggish": "debilitated" means weakened or hindered; "depressed" means feeling sad over a period of time or having the condition depression; and "dull" means boring or blunt.

The word "mature" or "maturity" are used to describe the character traits that come to something as it ages. In some ways, we talk about "mature" people, but in others, we can talk about "mature" fruits or cheese—cheese or fruits that have "come of age" and are now usesful. A number of the options try to trick you into choosing an answer based merely on age. Remember, though, maturity does not necessarily come with age. For example, you might know someone who is twenty years older than you but who never does any work and always relies upon other people. We would be quite wrong to call such a person mature.

Certainly, we can talk about "emotional maturity," which is a type of maturity. Someone who always gets angry or moody is probably not very emotionally mature. However, another general meaning for "mature" is "dependable." A mature person is someone who accepts responsibilities and can be depended upon to follow through on promises. This is the best option among those options given.

For something to be incessant, it means that it is continual.  For instance, an incessant noise indicates that the noise repeats itself.

"Inconvenient" is an adjective consisting of the negative prefix "in-" and "convenient," so we can infer that it means something like "not convenient"; it actually means "causing trouble, difficulties, or discomfort." So, we need to pick out an answer choice that means something like "not convenient" or "causing trouble." "Timely," then, cannot be the correct answer, because "timely" is an adjective that means "done or occurring at a favorable or useful time; opportune," making it an antonym, not a synonym, of "inconvenient." "Inopportune," however, is an adjective that consists of the negative prefix "in-" and "opportune," so it means "not opportune," or more specifically, "occurring at an inconvenient or inappropriate time." Because "inopportune" is the answer choice closest in meaning to "inconvenient," "inopportune" is the correct answer.

"Tardy" means late.

"Intermediate" means in the middle or in-between, so the best choice is "in-between" which also means in the middle. Don't confuse the word "meddle," which means to interfere, with the word "middle."

Something that is "chronic" continues for a long time. "Continual" is a synonym of "chronic." "Time" is not as good a choice because it refers to the general concept of time and not any length of time. "Old" also does not work here because it means great in age and does not refer to an ongoing process like the words "chronic" and "continual" do.

Seldom means rarely or not often happening, so "rarely" is the correct answer. To help you, "impressive" means demanding notice, striking, or great.

"Frequent" means happening again and again with little time in between events. Anorther word for "frequent" is often, so "often" is the correct answer. As for the other answer choices, "jealous" means envious or wanting what someone else has, "usually" means under normal circumstances, a "burrow" is a hole in the ground that certain animals dig and live in, and to "burrow" means to dig a hole in the ground, and "modest" means not taking as much credit as one should for one's achievements or talent.

Instantaneous means instant or occurring without any delay whatsoever. "Immediate" is the best answer choice because it also means instant.