OK, it's official -- the GRE vocabulary is kicking my ass. Another evening at the library produced the following example of an antonym question:

ACARPOUS:
a) assiduous
b) poignant
c) fecund
d) reticent
e) prolix

I have to note that this is the worst example I've come across, but still! Who is, off the top of their heads, going to know the meaning of 'acarpous,' let alone figure out which one of the others it its antonym?!? Anyway, my desperation (and a chat with Charity today) has led me to adopt, for the first time ever, the note-card system of studying. So far I have A-C words down -- progress is being made...