The only vocabulary I remember studying in school, and has been useful to me at times, was in my sophomore English class when we had vocabulary words on the board every day that we had to write down both the word and definition of, and then were quizzed on every quarter. I learned useful words, like capitulate, gambol, cacophony. And I still remember what they mean.
I guess my point is that I should be forcing myself to look up the meaning of words I only think I know. Perhaps one day, one word will get my thoughts unstuck and I can write something creative for a change.
1: having the appearance of truth : probable
2: depicting realism (as in art or literature)