available; (often followed by of or to) yielding readily to or capable of
People with weakened immune systems are more susceptible to serious infections from common viruses.
Vocabulary like susceptible appears on the Digital SAT in Words-in-Context questions, where you choose the word that fits a passage's meaning and tone. You can also drill this word with vocabulary flashcards.
replace; take the place or move into the position of
replace something else
guess; a message expressing an opinion based on incomplete evidence
forcibly put an end to
exceed; distinguish oneself
give up control or power
sneaky; marked by quiet and caution and secrecy; taking pains to avoid being observed
live on; continue to live through hardship or adversity