Does anyone know of some good ways to study vocabulary?

4 answers

Personally, I have always found homemade flash cards very cheap, quick, and effiective. Word on one side, definition on another.
In addition to Bobpursley's suggestion, I suggest you add a sentence using the word.
One of favorite professor's suggestions was to somehow find a way to meaningfully and personally connect a new word to yourself. Invest in a good dictionary and thesaurus. Learn how to use context clues to figure out unfamiliar terms before resorting to a dictionary, however. Explore etymology (word origins and roots). Read a lot of diverse material so that you encounter new vocabulary.
Kind of like Brandon's answer. Find something that it sounds like. Like efficacy means the power to produce a desired effect and it's kind of like efficiency which is the amount of power used to produce efficacy. Or grievous means sorrowful and i thought of general greevous from star wars... he was very sorrowful... and so on and so on. Pretty much every word has latin roots which are used through many words so if you find a word you know that has the same root it could help, like omniscient and science. Science means knowledge and omniscient means all knowing and the both have the root scient which means knowledge.