The prefix "post-" means after and "mort" means having to do with death, so the word “postmortem” means after death. To provide further help, “adolescence” is another word for teenage-years. 

The prefix pre- means before, so the word “precursory” means occurring before other things, the starting point, or “initial.” To provide further help, “metropolitan” means relating to city life, diverse and multi-cultural; “covert” means sneaky or hidden; “cumbersome” means heavy or burdensome; “despicable” means evil or wicked. 

Read the word very carefully: "immortal." Notice that it is made up of two parts: "im" + "mortal." The word "mortal" means able to die or something that leads to death. The prefix "im-" is the "privitive" use of "i-," meaning not. The extra "m" is added because of the "m" at the beginning of "mortal." Therefore, the word "im-mortal" means not able to die. Among the options, "deathless" is the best synonym. Do not confuse "immortal" with "immoral," which means lacking morality or wicked.

"Unhindered" is an adjective that means "not hindered or obstructed," so we need to pick out an adjective that means something like "unobstructed." So, "stymied" cannot be the correct answer, because "stymied" is an adjective that means "prevented or having the progress of (something) hindered," making the word an antonym, not a synonym, of "unhindered." "Unimpeded," however, means "not obstructed or hindered," and because "unimpeded" is the answer choice closest in meaning to "unhindered," "unimpeded" is the correct answer.

If someone is "unwelcome," they are not wanted or not welcome. You can figure this out, because "un-" means not, so "unwelcome" means not welcome. So, "unwanted," which means not wanted, is the correct answer, because it is closest in meaning to "unwelcome."

The root of this word, "detest," is a verb that means hate or fiercely dislike. Similarly, something that is "detestable" is deserving of deep hatred. Therefore, "hateful" is the correct answer choice. Even if you weren't sure, you could immediately eliminate "pleasant" and "attractive" because these adjectives have very positive connotations. The only remaining choice, "futile," refers to efforts that are pointless, not to objects or ideas that provoke hatred.

The prefix un- means either one or not. In this instance “unanimous” means sharing one opinion. This is closest in meaning to “undisputed” which means not disputed, not argued over. To provide further help, “impotent” means powerless; “inquiry” means formal investigation; “unbecoming” means not attractive; “underwhelming” means disappointing.

The prefix "con-" refers to joining or being joined, and “conjugal” is used to refer to things associated with marriage. As such, it is identical in meaning to “matrimonial.” To provide further help, “regal" means associated with or befitting royalty; “fraternal” means having to do with brotherhood; “matriarchal” is having to do with a society dominated by women, and “patriarchal” means having to do with a society dominated by men. Observe the differences between the prefixes "mat-," "frat-," and "pat-."

One might assume that "sneak" is the correct answer because "guile" means "sly or cunning intelligence" and "beguile" contains the word "guile." However, "beguile" means "charm or enchant someone, sometimes in a deceptive way" or "trick someone into doing something." So, between "charm" and "sneak," "charm" is actually the closer synonym of "beguile," so it is the correct answer.

"Belittle" means make a person seem or feel unimportant, so "criticize," which means point out the flaws in something or someone, is the best match. "Flatter" and "praise" are both opposites of "belittle."